yamllint: Make all files in awx pass yamllint

This commit updates all files that weren't passing yamllint for them to
pass.

A new yamllint target has been added. One can run `tox -e yamllint` or
`yamllint -s .` locally to ensure yaml files are still passing.

This check will be enabled in the CI so it can get on every new
contributions, and prevent merging non-compliant code.

Signed-off-by: Yanis Guenane <yguenane@redhat.com>

installer/roles/kubernetes/tasks/openshift_auth.yml

@@ -54,4 +54,3 @@
   fail:
     msg: "{{ openshift_auth_result.stderr | default('Invalid token') }}"
   when: openshift_auth_result.rc is defined and openshift_auth_result.rc != 0
-