message: Fix visibility of tensorflow_core
diff: @@ -4387,6 +4387,7 @@ py_library(
  srcs_version = "PY2AND3",
  visibility = visibility + [
  "//tensorflow:__pkg__",
  + "//third_party/py/tensorflow_core:__subpackages__",
  "//third_party/py/tf_agents:__subpackages__",
  ],
  deps = [
  