HBASE-9198 RpcClient#call could hang

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1513583 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9199 Call duration is not accurate

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1513585 13f79535-47bb-0310-9956-ffa450edef68