message: Expand visibility of tensorflow/core/framework:tensor_testutil.
  This is to prepare for the removal of tensorflow/core:tensor_testutil alias.
diff: @@ -510,7 +510,7 @@ cc_library(
  srcs = ["tensor_testutil.cc"],
  hdrs = ["tensor_testutil.h"],
  copts = tf_copts(),
  - visibility = ["//tensorflow/core:__subpackages__"],
  + visibility = ["//tensorflow:internal"],
  deps = [
  "//tensorflow/core:framework",
  "//tensorflow/core:lib",
  