Modified and added tests following review of WL#4738.

- Added tests for innodb and semisync plugin
 - Modified existing tests to include variable values in I_S tables
 - Updated the all_vars test to include optional checkes for INNODB and semisync plugin 
   if loaded

mysql-test/suite/sys_vars/r/innodb_adaptive_flushing_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_adaptive_hash_index_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_change_buffering_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_file_format_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_file_format_check_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_io_capacity_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_old_blocks_pct_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_old_blocks_time_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_read_ahead_threshold_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_read_io_threads_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_replication_delay_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_spin_wait_delay_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_stats_on_metadata_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_stats_sample_pages_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_strict_mode_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_thread_sleep_delay_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/innodb_use_sys_malloc_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_version_basic.result:
  New result file
mysql-test/suite/sys_vars/r/innodb_write_io_threads_basic.result:
  New result file
mysql-test/suite/sys_vars/r/last_insert_id_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/lc_messages_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/log_slow_queries_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/lower_case_file_system_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/lower_case_table_names_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/max_join_size_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/old_alter_table_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/optimizer_switch_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/profiling_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/profiling_history_size_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/pseudo_thread_id_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/rand_seed1_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/rand_seed2_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/relay_log_recovery_basic.result:
  Updated result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_master_enabled_basic.result:
  New result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_master_timeout_basic.result:
  New result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_master_trace_level_basic.result:
  New result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_master_wait_no_slave_basic.result:
  New result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_enabled_basic.result:
  New result file
mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_trace_level_basic.result:
  New result file
mysql-test/suite/sys_vars/r/sql_log_update_basic.result:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/r/sql_max_join_size_basic.result:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/r/sql_select_limit_basic.result:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/r/thread_cache_size_basic.result:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/all_vars-master.opt:
  Added opt file for all_vars.test
mysql-test/suite/sys_vars/t/all_vars.test:
  Modified test to check for semisync plugin and innodb
mysql-test/suite/sys_vars/t/innodb_adaptive_flushing_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_adaptive_hash_index_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_change_buffering_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_file_format_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_file_format_check_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_io_capacity_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_old_blocks_pct_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_old_blocks_time_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_read_ahead_threshold_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_read_io_threads_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_replication_delay_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_spin_wait_delay_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_stats_on_metadata_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_stats_sample_pages_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_strict_mode_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_thread_sleep_delay_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_use_sys_malloc_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_version_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/innodb_write_io_threads_basic.test:
  Added test for innodb variable
mysql-test/suite/sys_vars/t/last_insert_id_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/lc_messages_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/log_slow_queries_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/lower_case_file_system_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/lower_case_table_names_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/max_join_size_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/old_alter_table_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/optimizer_switch_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/profiling_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/profiling_history_size_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/pseudo_thread_id_basic.test:
  Added check for variable values in I_S tables and check for session variable 
  being numeric
mysql-test/suite/sys_vars/t/rand_seed1_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/rand_seed2_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/relay_log_recovery_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_enabled_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_enabled_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_timeout_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_timeout_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_trace_level_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_trace_level_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_wait_no_slave_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_master_wait_no_slave_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/rpl_semi_sync_slave_enabled_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_slave_enabled_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/rpl_semi_sync_slave_trace_level_basic-master.opt:
  Added option file for semisync variable test
mysql-test/suite/sys_vars/t/rpl_semi_sync_slave_trace_level_basic.test:
  Added test file for semisync variable
mysql-test/suite/sys_vars/t/sql_log_update_basic.test:
  Added check for variable values in I_S tables and check for ON/OFF value changes
mysql-test/suite/sys_vars/t/sql_max_join_size_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/sql_select_limit_basic.test:
  Added check for variable values in I_S tables
mysql-test/suite/sys_vars/t/thread_cache_size_basic.test:
  Added check for variable values in I_S tables

mysql-test/suite/sys_vars/r/log_slow_queries_basic.result

@@ -65,12 +65,22 @@ Warning	1287	The syntax '@@log_slow_queries' is deprecated and will be removed i
 SELECT @@global.log_slow_queries;
 @@global.log_slow_queries
 0
+SELECT IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
+WHERE VARIABLE_NAME='log_slow_queries';
+IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE
+1
 SET @@global.log_slow_queries = 1;
 Warnings:
 Warning	1287	The syntax '@@log_slow_queries' is deprecated and will be removed in MySQL 7.0. Please use '@@slow_query_log' instead
 SELECT @@global.log_slow_queries;
 @@global.log_slow_queries
 1
+SELECT IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
+WHERE VARIABLE_NAME='log_slow_queries';
+IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE
+1
 '#---------------------FN_DYNVARS_004_07----------------------#'
 SET @@global.log_slow_queries = TRUE;
 Warnings:
@@ -78,12 +88,22 @@ Warning	1287	The syntax '@@log_slow_queries' is deprecated and will be removed i
 SELECT @@global.log_slow_queries;
 @@global.log_slow_queries
 1
+SELECT IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
+WHERE VARIABLE_NAME='log_slow_queries';
+IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE
+1
 SET @@global.log_slow_queries = FALSE;
 Warnings:
 Warning	1287	The syntax '@@log_slow_queries' is deprecated and will be removed in MySQL 7.0. Please use '@@slow_query_log' instead
 SELECT @@global.log_slow_queries;
 @@global.log_slow_queries
 0
+SELECT IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
+WHERE VARIABLE_NAME='log_slow_queries';
+IF(@@global.log_slow_queries, "ON", "OFF") = VARIABLE_VALUE
+1
 '#---------------------FN_DYNVARS_004_08----------------------#'
 SET @@global.log_slow_queries = ON;
 Warnings: