HBASE-8282 User triggered flushes does not allow compaction to get triggered even if compaction criteria is met (Ram)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1484663 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd
Merge remote branch 'origin/0.94-gd' into fb-HBASE-8508-0.94-gd