* Switches python generators to use pytest, useNose CLI option added if to allow nose to be used instead
* Adds ensure-up-to-date changes
* Adds setup.cfg to python clients so we can configure nose when useNose=true
* Adds fix for python-aiohttp testing, adds files missing from ensure-up-to-date
* add multiple server support to python client
* various fixes
* minor fixes, add tests
* test oas2 python first
* fix tests
* fix issues reported by flake8
* update code format
* add python petstore to ensure up-to-date
* rearrange test
* fix E501
* fix tests
* add new files
* fix script permission
* fix index check
* update samples