--log-raw is now a system variable. It can be queried at run-time
to facilitate auditing. As a global system variable, its value can
be changed by users who have the SUPER permission. (Also fixes its
duplicate, Bug#19622629).

Original patch creator was has left, so patch is pushed by
a reviewer (Tatiana).

Approved by: Harin Vadodaria <harin.vadodaria@oracle.com>