message: Fix small typo in mirroring policy property getter
diff: @@ -1347,7 +1347,7 @@ class Context(object):
  if self._context_handle is not None:
  return pywrap_tensorflow.TFE_ContextGetMirroringPolicy(self._handle)
  - return self._device_policy
  + return self._mirroring_policy
  @mirroring_policy.setter
  def mirroring_policy(self, policy):
  