Ticket 47815 - Add operations rejected by betxn plugins remain in cache
Bug Description: When an add operation is rejected by a betxn post plugin
the "adding" entry is removed the cache(previously added
tentatively), it gets re-added back to the entry cache
when we call betxn post plugins just before the abort.
Fix Description: Remove the entry from the cache when the 2nd run of
the betxn postop plugins fails(just before we abort
the transaction).
https://fedorahosted.org/389/ticket/47815
valgrind: passed
jenkins: passed
Reviewed by: nhosoi(Thanks!)