- global requirements sync
- switch to stable/newton

update to version 4.9.0
* PEP257: add flake8-docstring testing
* PEP257: Ignore D203 because it was deprecated
* Use oslo.config fixture in audit tests
* Add a fixture method to add your own token data
* Remove bandit.yaml in favor of defaults
* Fix typo 'olso' to 'oslo'
* Fix D105: Missing docstring in magic method (PEP257)
* remove old options from documentation
* Extract a common notifier pattern
* Refactor audit api tests into their own file
* Return default value for pkg_version if missing
* Fix an issue with oslo_config_project paste config
* Use extras for oslo.messaging dependency
* Move auth token opts calculation into auth_token
* Fix D204 PEP257 violation and enable D301 and D209
* Fix doc build if git is absent
* Fix D401 PEP257 violation and enable H403
* Add Python 3.5 classifier
* Refactor create_event onto the api object.
* Use AccessInfo in UserAuthPlugin instead of custom
* Pop oslo_config_config before doing paste convert
* Remove oslo-incubator
* Create signing_dir upon first usage
* Fix D202: No blank lines allowed after function docstring (PEP257)
* Use jsonutils instead of ast for loading the service catalog
* Make sure audit can handle API requests which does not require a token