PASSWORDS LOGGED IN CLEAR TEXT

Description:- Passwords which fail validation by the
password validation plugin are logged in mysqld error log
as warning messages in clear text.

Analysis:- Logging of warning message for completely failed
"GRANT/REVOKE users" queries is added as part of another bug
fix. The intention of that bug fix was to handle partial
execution of queries by adding an incident event in the
binary log. But along with addition of incident event in the
binary log for partial execution, a warning message is also
added for quires which fails completely.

Fix:- Logging of warning message to the mysqld error log
is removed which will in turn solve this issue.