BUG#11316 mysqltest, problems when assigning value with '#' to $variable

- Fixed problem, only detect comment if the # is on start of line AND starting line of the current command.
 - Wrote tests for most of the mysqltest commands, added stricter checking of correct syntax.


client/mysqltest.c:
  Updated mysql test to do stricter checking of syntax. For example when the number 
  of arguments to a command is known, everything else is "junk" => die. 
  Better checking of argument types.
  Added better debug printouts.
  Added improved printouts when wrong syntax is detected.
  Fix two bugs where mysqltest could not detect end of comamnd properly, as described in bug#11316
  Fix segfault when performing too many source commands.
  Fix segfault when doing too many while loop levels.
  Add printout of line number in die
  Remove lineno and \n in all strings passed to die function.
  Decrese BLOCK_STACK_DEPTH from 32 to 16, does any test use more than 1 level?
mysql-test/mysql-test-run.pl:
  export MYSQL_TEST environment variable, used from msyqltest.test
mysql-test/mysql-test-run.sh:
  export MYSQL_TEST environment variable, used from msyqltest.test
mysql-test/r/mysqltest.result:
  Updated test results
mysql-test/r/rpl_flush_log_loop.result:
  Updated test result.
  Approved by lars
mysql-test/t/innodb-deadlock.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/innodb-lock.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/mysqltest.test:
  Add several new tests  for mysqltest.
  Foxus on detecting wrong syntax in test files.
  Use exec with expected error to execute test scripts that will kill mysqltest
  Change some negative test that were previously commented out to use the above method.
mysql-test/t/ndb_autodiscover2.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/rpl_change_master.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/rpl_deadlock.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/rpl_drop_temp.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/rpl_flush_log_loop.test:
  Fix after detecting wrong syntax, missing ;
  Discussed with lars.
mysql-test/t/rpl_insert_id.test:
  Missing ;
mysql-test/t/rpl_rotate_logs.test:
  Correct wrong syntax
  Superfluos ;
mysql-test/t/rpl_until.test:
  Missing delimiter
mysql-test/include/mysqltest_while.inc:
  New file to test too many while levels

mysql-test/r/mysqltest.result

@@ -7,6 +7,7 @@ otto
 select otto from (select 1 as otto) as t1;
 otto
 1
+mysqltest: At line 1: query 'select friedrich from (select 1 as otto) as t1' failed: 1054: Unknown column 'friedrich' in 'field list'
 select friedrich from (select 1 as otto) as t1;
 ERROR 42S22: Unknown column 'friedrich' in 'field list'
 select otto from (select 1 as otto) as t1;
@@ -15,10 +16,12 @@ otto
 select otto from (select 1 as otto) as t1;
 otto
 1
+mysqltest: At line 1: query 'select otto from (select 1 as otto) as t1' succeeded - should have failed with sqlstate 42S22...
 select friedrich from (select 1 as otto) as t1;
 ERROR 42S22: Unknown column 'friedrich' in 'field list'
 select friedrich from (select 1 as otto) as t1;
 ERROR 42S22: Unknown column 'friedrich' in 'field list'
+mysqltest: At line 1: query 'select friedrich from (select 1 as otto) as t1' failed with wrong sqlstate 42S22 instead of 00000...
 select otto from (select 1 as otto) as t1;
 otto
 1
@@ -135,6 +138,8 @@ ERROR 42S02: Table 'test.t1' doesn't exist
 select 1146 as "after_!errno_masked_error" ;
 after_!errno_masked_error
 1146
+mysqltest: At line 1: query 'select 3 from t1' failed with wrong errno 1146 instead of 1000...
+mysqltest: At line 1: query 'select 3 from t1' failed with wrong errno 1146 instead of 1000...
 garbage ;
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
 select 1064 as "after_--enable_abort_on_error" ;
@@ -142,3 +147,119 @@ after_--enable_abort_on_error
 1064
 select 3 from t1 ;
 ERROR 42S02: Table 'test.t1' doesn't exist
+mysqltest: At line 1: query 'select 3 from t1' failed with wrong errno 1146 instead of 1064...
+mysqltest: At line 1: query 'select 3 from t1' failed: 1146: Table 'test.t1' doesn't exist
+hello
+hello
+;;;;;;;;
+# MySQL: -- The
+mysqltest: At line 1: End of line junk detected: "6"
+mysqltest: At line 1: End of line junk detected: "6"
+mysqltest: At line 1: Missing delimiter
+mysqltest: At line 1: Extra delimiter ";" found
+MySQL
+"MySQL"
+MySQL: The world''s most popular open source database
+"MySQL: The world's most popular open source database"
+MySQL: The world''s
+most popular open
+source database
+# MySQL: The world''s
+# most popular open
+# source database
+- MySQL: The world''s
+- most popular open
+- source database
+- MySQL: The world''s
+-- most popular open
+-- source database
+# MySQL: The
+--world''s
+# most popular
+-- open
+- source database
+"MySQL: The world's most popular; open source database"
+"MySQL: The world's most popular ; open source database"
+"MySQL: The world's most popular ;open source database"
+echo message echo message
+
+mysqltest: At line 1: Empty variable
+sh: -c: line 0: syntax error near unexpected token `;'
+sh: -c: line 0: `;'
+mysqltest: At line 1: command ";" failed
+mysqltest: At line 1: Missing argument in exec
+MySQL
+"MySQL"
+MySQL: The
+world''s most
+popular open
+source database
+# MySQL: The
+# world''s most
+# popular open
+# source database
+-- MySQL: The
+-- world''s most
+-- popular open
+-- source database
+# MySQL: The
+- world''s most
+-- popular open
+# source database
+'$message'
+"$message"
+hej
+hej 
+hej
+mysqltest: At line 1: Missing arguments to let
+mysqltest: At line 1: Missing variable name in let
+mysqltest: At line 1: Variable name in hi=hi does not start with '$'
+mysqltest: At line 1: Missing assignment operator in let
+mysqltest: At line 1: Missing assignment operator in let
+mysqltest: At line 1: Missing arguments to let
+mysqltest: At line 1: Missing variable name in let
+mysqltest: At line 1: Variable name in =hi does not start with '$'
+mysqltest: At line 1: Missing assignment operator in let
+mysqltest: At line 1: Missing file name in source
+mysqltest: At line 1: Could not open file ./non_existingFile
+mysqltest: In included file "./var/tmp/recursive.sql": At line 1: Source directives are nesting too deep
+mysqltest: In included file "./var/tmp/error.sql": At line 1: query 'garbage ' failed: 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+mysqltest: At line 1: Missing argument to sleep
+mysqltest: At line 1: Invalid argument to sleep "abc"
+1
+2
+101
+hej
+1
+mysqltest: At line 1: Missing arguments to inc
+mysqltest: At line 1: First argument to inc must be a variable (start with $)
+mysqltest: At line 1: End of line junk detected: "1000"
+4
+4
+-1
+-2
+99
+hej
+-1
+mysqltest: At line 1: Missing arguments to dec
+mysqltest: At line 1: First argument to dec must be a variable (start with $)
+mysqltest: At line 1: End of line junk detected: "1000"
+mysqltest: At line 1: Missing arguments to system, nothing to do!
+mysqltest: At line 1: Missing arguments to system, nothing to do!
+sh: NonExistsinfComamdn: command not found
+mysqltest: At line 1: system command 'NonExistsinfComamdn' failed
+test
+test2
+test3
+test4
+1
+mysqltest: In included file "./include/mysqltest_while.inc": At line 32: Nesting too deeply
+mysqltest: At line 1: missing '(' in while
+mysqltest: At line 1: missing ')' in while
+mysqltest: At line 1: Missing '{' after while. Found "dec $i"
+mysqltest: At line 1: Stray '}' - end of block before beginning
+mysqltest: At line 1: Stray '}' - end of block before beginning
+mysqltest: At line 1: query '' failed: 1065: Query was empty
+mysqltest: At line 1: Missing '{' after while. Found "echo hej"
+mysqltest: At line 3: Missing end of block
+mysqltest: At line 1: Missing newline between while and '{'