HBASE-10545 RS Hangs waiting on region to close on shutdown; has to timeout before can go down

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1568707 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10550 Register HBase tokens with ServiceLoader

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1568735 13f79535-47bb-0310-9956-ffa450edef68