HBASE-7992 provide pre/post region offline hooks for HMaster.offlineRegion() (Rajeshbabu)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1457854 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8097 MetaServerShutdownHandler may potentially keep bumping up DeadServer.numProcessing (Jeffrey Zhong)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1457932 13f79535-47bb-0310-9956-ffa450edef68