Install converter as a command line utility in the pip package.

RELNOTES: Add a command line tool to convert to TF2.0
PiperOrigin-RevId: 222901543

tensorflow/tools/pip_package/setup.py

@@ -107,6 +107,7 @@ CONSOLE_SCRIPTS = [
     # TensorBoard command, pip will inappropriately remove it during install,
     # even though the command is not removed, just moved to a different wheel.
     'tensorboard = tensorboard.main:run_main',
+    'tf_upgrade_v2 = tensorflow.python.tools.compatibility.tf_upgrade_v2:main',
 ]
 # pylint: enable=line-too-long