Problem:
========
Calling my_message from within an audit plugin during handling MYSQL_AUDIT_GENERAL_ERROR event
causes the audit error event generating mechanism to fall into infinite recursion, which ends
with the server crash.

Fix:
====
A condition has been embedded into event generating mechanism that stops infinite recursion,
when the stack size shrinks to a certain value. This fix does not prevent infinite recursion
but stops it instead. The server does not crash and the ER_STACK_OVERRUN_NEED_MORE error is
generated.

null_audit_event_order_check_consume_ignore_count global variable was introduced that prevents
clearing null_audit_event_order_check variable certain number of times. This allows to simulate
infinite and non-infinite recursion during testing.

Reviewed-by:
============
Georgi Kodinov <georgi.kodinov@oracle.com>
Ramil Kalimullin <ramil.kalimullin@oracle.com>
Evgeny Potemkin <evgeny.potemkin@oracle.com>