Adding yamllinter to ci steps (#1556)

* 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

roles/dnsmasq/tasks/main.yml

@@ -86,4 +86,3 @@
     port: 53
     timeout: 180
   when: inventory_hostname == groups['kube-node'][0] and groups['kube-node'][0] in ansible_play_hosts
-