Updated mtr files to support different compiled in options

This allows one to run the test suite even if any of the following
options are changed:
- character-set-server
- collation-server
- join-cache-level
- log-basename
- max-allowed-packet
- optimizer-switch
- query-cache-size and query-cache-type
- skip-name-resolve
- table-definition-cache
- table-open-cache
- Some innodb options
etc

Changes:
- Don't print out the value of system variables as one can't depend on
  them to being constants.
- Don't set global variables to 'default' as the default may not
  be the same as the test was started with if there was an additional
  option file. Instead save original value and reset it at end of test.
- Test that depends on the latin1 character set should include
  default_charset.inc or set the character set to latin1
- Test that depends on the original optimizer switch, should include
  default_optimizer_switch.inc
- Test that depends on the value of a specific system variable should
  set it in the test (like optimizer_use_condition_selectivity)
- Split subselect3.test into subselect3.test and subselect3.inc to
  make it easier to set and reset system variables.
- Added .opt files for test that required specfic options that could
  be changed by external configuration files.
- Fixed result files in rockdsb & tokudb that had not been updated for
  a while.

mysql-test/t/variables.test

@@ -36,7 +36,9 @@ set @my_thread_cache_size         =@@global.thread_cache_size;
 set @my_max_allowed_packet        =@@global.max_allowed_packet;
 set @my_delay_key_write           =@@global.delay_key_write;
 set @my_join_buffer_size          =@@global.join_buffer_size;
-set @my_log_warnings               =@@global.log_warnings;
+set @my_log_warnings              =@@global.log_warnings;
+set @my_local_infile              =@@global.local_infile;
+
 # case insensitivity tests (new in 5.0)
 set @`test`=1;
 select @test, @`test`, @TEST, @`TEST`, @"teSt";
@@ -314,7 +316,6 @@ set max_heap_table_size=100;
 set max_join_size=100;
 set max_sort_length=100;
 set global max_user_connections=100;
-select @@max_user_connections;
 set global max_write_lock_count=100;
 set myisam_sort_buffer_size=100;
 set global net_buffer_length=100;
@@ -423,6 +424,10 @@ set global myisam_max_sort_file_size=default;
 #
 # swap
 #
+
+# set some variables to play with
+set @@global.max_user_connections=10, @@local.max_join_size=1000;
+
 select @@global.max_user_connections,@@local.max_join_size;
 set @svc=@@global.max_user_connections, @svj=@@local.max_join_size;
 select @@global.max_user_connections,@@local.max_join_size;
@@ -435,6 +440,7 @@ select @@global.max_user_connections,@@local.max_join_size;
 set @a=1, @b=2;
 set @a=@b, @b=@a;
 select @a, @b;
+set @@global.max_user_connections=@my_max_user_connections;
 
 #
 # Bug#2586:Disallow global/session/local as structured var. instance names
@@ -814,12 +820,13 @@ set global net_write_timeout         =@my_net_write_timeout;
 set global net_read_timeout          =@my_net_read_timeout;
 set global server_id                 =@my_server_id;
 set global slow_launch_time          =@my_slow_launch_time;
-set global default_storage_engine            =@my_storage_engine;
+set global default_storage_engine    =@my_storage_engine;
 set global thread_cache_size         =@my_thread_cache_size;
-set global max_allowed_packet        = default;
+set global max_allowed_packet        =@my_max_allowed_packet;
 set global delay_key_write           =@my_delay_key_write;
 set global join_buffer_size          =@my_join_buffer_size;
 set global log_warnings              =@my_log_warnings;
+set global local_infile              =@my_local_infile;
 
 #
 # Bug#28580 Repeatation of status variables
@@ -891,10 +898,11 @@ SET @@global.ft_stopword_file= 'x';
 # Additional variables fixed.
 #
 --echo #
+--replace_column 2 #
 SHOW VARIABLES like 'back_log';
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 SELECT @@session.back_log;
-SELECT @@global.back_log;
+SELECT @@global.back_log > 0;
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 SET @@session.back_log= 7;
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
@@ -1208,7 +1216,8 @@ SET GLOBAL max_binlog_cache_size = @old_max_binlog_cache_size;
 --echo # Bug #37168 : Missing variable - skip_name_resolve
 --echo #
 
-SELECT @@skip_name_resolve;
+SELECT @@skip_name_resolve >= 0;
+--replace_column 2 #
 SHOW VARIABLES LIKE 'skip_name_resolve';
 
 --echo #
@@ -1258,7 +1267,7 @@ SET @@global.key_cache_block_size=@kcbs;
 #
 # Bug#56976: added new start-up parameter
 #
-select @@max_long_data_size;
+select @@max_long_data_size > 0;
 
 --echo #
 --echo # Bug#11766424  59527: