HBASE-7957 CloneSnapshotHandler.prepare() is not called by SnapshotManager

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1451301 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7956 RegionCoprocessorRpcChannel should log rpc requests at TRACE level rather than DEBUG

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1451305 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7902 deletes may be removed during minor compaction, in non-standard compaction schemes

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1451314 13f79535-47bb-0310-9956-ffa450edef68