v0.11.0

Massive best-practices refactory:

Ideology

1. Emphasizing pylint suggestions;
2. Drop functionality which are not very pythonic;
3. Thin down core functionality where it is over developed and cumbersome.

Implementation

1. Drop the plugin type enumerator, which locked out any run-time contrib extension;
2. Drop plugin base classes where they didn't provide any real value;
3. Make Fixtures iterable so that less methods are needed;
4. Move tests into the mirantis/testing core or contrib, where they make more sense;
5. Develop some automation for assisting in linting;
6. Massive linting suggestion implementation;
7. Separation of dev and stable test suites.

Not done in this upgrade:

1. Wanted to cleanup the Environment implementation, but didn't get to do much - it needs more design.