Signed-off-by: Victor Morales <v.morales@samsung.com>

* updated ansible pinning to prevent more possibilities of breaking changes

* more exact pinning of ansible version

* more exact pinning of ansible version and also all the rest

* added testing requirements.txt pinning settings

* removed boto from testing requirements.txt

* Add ansible-lint as gitlab-ci step

* Fix jinja2 syntax in include_tasks that breaks ansible-lint

* Use a block scalar to get around gitlab quoting/escaping rules

* Run ansible-lint in verbose mode in CI

Use image family for picking latest coreos image
Update python deps

* 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