@Test
  public void testFallbackToDefaultRpcControllerFactory() {
    Configuration conf = new Configuration(UTIL.getConfiguration());
    conf.set(RpcControllerFactory.CUSTOM_CONTROLLER_CONF_KEY, "foo.bar.Baz");

    // Should not fail
    RpcControllerFactory factory = RpcControllerFactory.instantiate(conf);
    assertNotNull(factory);
    assertEquals(factory.getClass(), RpcControllerFactory.class);
  }
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