HBASE-8232. TestAccessController occasionally fails with IndexOutOfBoundsException

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1462996 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8226. HBaseTestingUtility#waitUntilAllRegionsAssigned won't return if it counts "too many" regions