Fixed pep8 failures of base/setup.py and settings_example.py
Got base/relengapi/blueprints/docs/src/conf.py passing pep8 checks
Disable maybe-no-member pylint test (see https://bugzilla.mozilla.org/show_bug.cgi?id=847640#c23)
Add db.UniqueMixin and adjust pylint as necessary with new ignores