int verifyCount(Integer counter) {
    assertTrue(CountingRpcController.INT_PRIORITY.get() >= counter);
    return CountingRpcController.GROUPED_PRIORITY.count(HConstants.NORMAL_QOS) + 1;
  }
check some of the methods and make sure we are incrementing each time. Its a bit tediuous to
cover all methods here and really is a bit brittle since we can always add new methods but
won't be sure to add them here. So we just can cover the major ones.
@throws Exception on failure
hbase-endpoint/src/test/java/org/apache/hadoop/hbase/client/TestRpcControllerFactory.java