@Override
      public Object run() throws Exception {
        ACCESS_CONTROLLER.preSwitchExceedThrottleQuota(ObserverContextImpl.createAndPrepare(CP_ENV),
          true);
        return null;
      }
List all user permissions match the given regular expression for namespace and verify each of
them.
@param namespaceRegexWithoutPrefix the regualar expression for namespace, without
                                   NAMESPACE_PREFIX
@param expectedAmount              the expected amount of user permissions returned
@param expectedNamespace           the expected namespace of each user permission returned
@throws HBaseException in the case of any HBase exception when accessing hbase:acl table
hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/TestAccessController.java