Fixed format string vulnerability in reddwarf call to OpenstackException handler

Exception messages from the mysql extension which may contain user input are
now properly escaped. This fixes any chance of a format string vulnerability.

Fixed bug: 1177936

Change-Id: I7762f605f08a7e7b5f884ee4062aa16e4048f928
Merge "Fixed format string vulnerability in reddwarf call to OpenstackException handler"