HBASE-10508 Backport HBASE-10365 'HBaseFsck should clean up connection properly when repair is completed' to 0.94 and 0.96



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1567678 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10506 Fail-fast if client connection is lost before the real call be executed in RPC layer

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1567845 13f79535-47bb-0310-9956-ffa450edef68