class_docstr: Multi worker fault tolerance tests.
  
  This covers the ordinary cases where multiple workers and PS are used.
code: def setUp(self):
      super(MultiWorkerFaultToleranceTest, self).setUp(2, 2)
  
imports: import threading
  import time
  from tensorflow.python.compat import v2_compat
  from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.distribute import parameter_server_strategy_v2
  from tensorflow.python.distribute.cluster_resolver.cluster_resolver import SimpleClusterResolver
  from tensorflow.python.distribute.coordinator import cluster_coordinator
  from tensorflow.python.distribute.coordinator import fault_tolerance_test_base
  from tensorflow.python.eager import test
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 1 for calling the MultiWorkerFaultToleranceTest obj's underlying member method code with example usage: obj.setUp() without return types