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

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1516368 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8565 stop-hbase.sh clean up: backup master

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1516369 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.95' into 0.95-gd