message: Mark multi-process utilities with subprocess module as deprecated in favor of using MultiProcessRunner.
diff: @@ -50,6 +50,7 @@ from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging as logging
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import server_lib
  +from tensorflow.python.util import deprecation
  from tensorflow.python.util import nest
  from tensorflow.python.util.compat import collections_abc
  @@ -559,6 +560,10 @@ class MultiWorkerMultiProcessTest(test.TestCase):
  return subprocess.Popen(
  cmd_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
  + @deprecation.deprecated(
  + None, '`run_multiple_tasks_in_processes` is deprecated; any new test '
  + 'requiring multiple processes should use `multi_process_runner` for '
  + 'better support of log printing, streaming, and more functionality.')
  def run_multiple_tasks_in_processes(self, cmd_args, cluster_spec):
  """Run `cmd_args` in a process for each task in `cluster_spec`."""
  processes = {}
  @@ -570,6 +575,10 @@ class MultiWorkerMultiProcessTest(test.TestCase):
  processes[task_type].append(p)
  return processes
  + @deprecation.deprecated(
  + None, '`join_independent_workers` is deprecated; any new test '
  + 'requiring multiple processes should use `multi_process_runner` for '
  + 'better support of log printing, streaming, and more functionality.')
  def join_independent_workers(self, worker_processes):
  return_codes = []
  for p in nest.flatten(worker_processes):
  @@ -585,6 +594,10 @@ class MultiWorkerMultiProcessTest(test.TestCase):
  for return_code in return_codes:
  self.assertEqual(return_code, 0)
  + @deprecation.deprecated(
  + None, '`stream_stderr` is deprecated; any new test '
  + 'requiring multiple processes should use `multi_process_runner` for '
  + 'better support of log printing, streaming, and more functionality.')
  def stream_stderr(self, processes, print_only_first=False):
  """Consume stderr of all processes and print to stdout.
  