- global requirements sync
- switch to stable/newton

- update to 3.19.0:
* Remove pot files
* Fix inline docstring to use default path (not /status)
* Updated from global requirements
* Updated from global requirements
* Fixed typo in SSL

- update to version 3.16.0
* Do not add a default content type when replying
* Expose sample config opts for http-proxy-to-wsgi
* Deprecate using String as valid value for allowed_origin.
* Deprecate multiple config block parsing.
* Fix unit tests on Windows
* Fix spelling of config option help
* Updated from global requirements

- update to 3.11.0:
* cors: remove unused import
* Updated from global requirements
* Add a simple __main__ to easily show healthcheck output
* Removed simple headers from documentation examples
* Added PATCH method to default config
* Added set_defaults method to oslo_middleware.cors
* Set default allow methods to those defined in RFC 2616
* Removed default headers from CORS_OPTS
* Imported Translations from Zanata
* Updated from global requirements