HBASE-9650 Per region metrics are not showing up for system tables.

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1526310 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9653 Add compaction metrics to trunk

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1526312 13f79535-47bb-0310-9956-ffa450edef68