Fix to the sporadic failure on purge_logically_deleted_doc_test
Fix to the sporadic failure on purge_logically_deleted_doc_test

Change-Id: I9a5e42a288750e68a9ea614bf45d7328bf83f7f3

hisundar/forestdb,hisundar/forestdb,couchbase/forestdb,couchbase/forestdb,wurikiji/forestdb,wurikiji/forestdb