- update to 2.2.0:
* Standardize an oslo.policy credentials dictionary
* Revert "Add common oslo.log format parameters"
* Add roles to context
* Agnostic approach to construct context from_dict
* Add common oslo.log format parameters
* Improve Context docs with example syntax
* Define method for oslo.log context parameters
* Add additional unit tests
* Fix request_id type on Python 3: use text (Unicode)
* Updated from global requirements
* Provide a helper to load a context from environment
* Revert "Add properties for id attributes"
* Add properties for id attributes
* Trival: Remove 'MANIFEST.in'
* Updated from global requirements
* Remove python 2.6 classifier
* Remove python 2.6 and cleanup tox.ini
* Remove reference to undefined attributes
* Fix coverage configuration and execution
* Add shields.io version/downloads links/badges into README.rst
* Change ignore-errors to ignore_errors
* Updated from global requirements