HBASE-8461 Provide the ability to delete multiple snapshots through single command (Ted Yu)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1483574 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8564 TestMetricsRegionServer depends on test order

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1483617 13f79535-47bb-0310-9956-ffa450edef68