OPENJPA-2449: refresh(PESSIMISTIC_WRITE) generates seperate SQL for the lock - applied to 2.2.1.x Albert Lee's patch.

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.2.1.x@1539193 13f79535-47bb-0310-9956-ffa450edef68