- Update _service and switch to upstream spec

update to version 1.2.0
* Fix tests related to queue attributes in API V2
* Create a websocket transport
* Implement CLI support for pool delete
* Remove discover from test-requirements
* Fix unexpected output of pools()
* Remove unused pngmath Sphinx extension
* Flavor list support for v2
* Add update queue function in v2
* Do not catch ConflictError on subscription create
* Update pool on pool create if it exists
* Use v2 as the default cli version
* improve readme contents
* Remove periods of docstring
* Make TransportErrors more descriptive
* Pool delete cli support for v2
* Add cli support for flavor update v1
* Clean up flavor test classes
* Use API version checking directly
* Added support to v2
* Flavor update cli support for v2
* Delete CLI for Get/SetQueueMetadata which is API-v1 only
* Updated from global requirements
* Pool update support for v2
* Refactor the test for v2 queues and messages
* Query claim CLI support for v1
* Update the functional test
* Add requests-mock to test-requirements.txt