* Added support for setting tiller_service_account and tiller_replicas
* Specify helm 2 version to ensure we have a test path that still hits helm 2 code
* Moved tiller_service_account to defaults.yml. Fixed is tiller_replicas defined check.
* Adding yaml linter to ci check
* Minor linting fixes from yamllint
* Changing CI to install python pkgs from requirements.txt
- adding in a secondary requirements.txt for tests
- moving yamllint to tests requirements