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
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-666-trunk-gd