HBASE-8441 [replication] Refactor KeeperExceptions thrown from replication state interfaces into replication specific exceptions

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1516367 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8565 stop-hbase.sh clean up: backup master

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1516370 13f79535-47bb-0310-9956-ffa450edef68