This patchset removes the lingering code that supported paste.deploy
that is obsolted by the loader wrapped around keystone's use of Flask.
* The keystone-paste.ini file has been removed.
* All options have been removed (without deprecation) as they are no
longer referenced.
* The TokenAuthMiddleware code (with deprecation warning) has been
removed as it was only provided to ensure compatibility with paste.ini
files that were not updated (ensuring not breaking a deployer that
did not update paste.ini file to remove it from the pipeline).
* Paste deploy entrypoints have been removed.
Change-Id: I35064a440ef718f50c7e644e8b2d56a99c3ec74f
8bf335bb01