HBASE-8169 TestMasterFailover#testMasterFailoverWithMockedRITOnDeadRS may fail due to regions randomly assigned to a RS (Jeffrey Zhong)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1464787 13f79535-47bb-0310-9956-ffa450edef68