HBASE-9547 Master could fail start if region server with system table is down

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1523522 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9529 Audit of hbase-client @InterfaceAudience.Public apis


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1523542 13f79535-47bb-0310-9956-ffa450edef68