HBASE-9194 Break HMaster metrics into multiple contexts

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1514513 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9023 TestIOFencing.testFencingAroundCompactionAfterWALSync occasionally fails



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1514538 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9236 region_mover#getTable() should use TableName.toString() instead of Bytes.toString()



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1514552 13f79535-47bb-0310-9956-ffa450edef68