HBASE-5945 Reduce buffer copies in IPC server response path

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1543458 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9995 Not stopping ReplicationSink when using custom implementation for the ReplicationSink

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1543501 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9989 Add a test on get in TestClientNoCluster

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1543514 13f79535-47bb-0310-9956-ffa450edef68