message: Change the Keras saving lib back to use py_library.
diff: # buildifier: disable=same-origin-load
  -load("//tensorflow:tensorflow.bzl", "py_strict_library")
  -
  package(
  default_visibility = [
  "//tensorflow/python/keras:__subpackages__",
  @@ -29,7 +27,7 @@ package(
  exports_files(["LICENSE"])
  -py_strict_library(
  +py_library(
  name = "utils_v1",
  srcs = [
  "__init__.py",
  @@ -39,7 +37,7 @@ py_strict_library(
  "signature_def_utils.py",
  "unexported_constants.py",
  ],
  - srcs_version = "PY2AND3",
  + srcs_version = "PY3",
  deps = [
  "//tensorflow/python:constant_op",
  "//tensorflow/python:dtypes",
  