Problem:
========
MYSQL_AUDIT_PARSE_PREPARSE event could not be aborted by calling the my_message function,
or by returning a non zero value from within an audit plugin. This was caused by different
diagnostic area, used during generation of the MYSQL_AUDIT_PARSE_PREPARSE event, comaparing
to the diagnostic area, used when evaluating the query execution.

Fix:
====
The fix copies the error state of the audit plugin's diagnostic area to the diagnostic area
of the executing statement.

Reviewed-by:
============
Georgi Kodinov <georgi.kodinov@oracle.com>
Kristofer Pettersson <kristofer.pettersson@oracle.com>