BUG#37718: rpl.rpl_stm_mystery22 fails sporadically on pushbuild
Problem 1: The test waits for an error in the slave sql thread, then resolves the error and issues 'start slave'. However, there is a gap between when the error is reported and the slave sql thread stops. If this gap was long, the slave would still be running when 'start slave' happened, so 'start slave' would fail and cause a test failure. Fix 1: Made wait_for_slave_sql_error wait for the slave to stop instead of wait for error in the IO thread. After stopping, the error code is verified. If the error code is wrong, debug info is printed. To print debug info, the debug printing code in wait_for_slave_param.inc was moved out to a new file, show_rpl_debug_info.inc. Problem 2: rpl_stm_mystery22 is a horrible name, the comments in the file didn't explain anything useful, the test was generally hard to follow, and the test was essentially duplicated between rpl_stm_mystery22 and rpl_row_mystery22. Fix 2: The test is about conflicts in the slave SQL thread, hence I renamed the tests to rpl_{stm,row}_conflicts. Refactored the test so that the work is done in extra/rpl_tests/rpl_conflicts.inc, and rpl.rpl_{row,stm}_conflicts merely sets some variables and then sourced extra/rpl_tests/rpl_conflicts.inc. The tests have been rewritten and comments added. Problem 3: When calling wait_for_slave_sql_error.inc, you always want to verify that the sql thread stops because of the expected error and not because of some other error. Currently, wait_for_slave_sql_error.inc allows the caller to omit the error code, in which case all error codes are accepted. Fix 3: Made wait_for_slave_sql_error.inc fail if no error code is given. Updated rpl_filter_tables_not_exist accordingly. Problem 4: rpl_filter_tables_not_exist had a typo, the dollar sign was missing in a 'let' statement. Fix 4: Added dollar sign. Problem 5: When replicating from other servers than the one named 'master', the wait_for_slave_* macros were unable to print debug info on the master. Fix 5: Replace parameter $slave_keep_connection by $master_connection.
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