message: Replace spaces with underscore when making scope name.
  An upcoming change in absl's parameterized introduces spaces
  into the test id, which are invalid as scope names.
diff: @@ -959,7 +959,8 @@ class DataTypesTest(test_util.TensorFlowTestCase):
  class IndexedCaseTest(test_util.TensorFlowTestCase, parameterized.TestCase):
  def make_name(self):
  - return self.id().split(".")[-1].replace("(", "_").replace(")", "")
  + name = self.id().split(".")[-1].replace("(", "_").replace(")", "")
  + return name.replace(" ", "_")
  def disabled_testCase_ticklesGpuVsHostMemoryIssueWithInt32(self):
  nbranches = 5
  