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>

docs/container_groups/service-account.yml

@@ -21,12 +21,12 @@ kind: Role
 metadata:
   name: pod-manager
 rules:
-- apiGroups: [""] # "" indicates the core API group
-  resources: ["pods"]
-  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
-- apiGroups: [""]
-  resources: ["pods/exec"]
-  verbs: ["create"]
+  - apiGroups: [""]  # "" indicates the core API group
+    resources: ["pods"]
+    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+  - apiGroups: [""]
+    resources: ["pods/exec"]
+    verbs: ["create"]
 
 ---
 kind: RoleBinding
@@ -34,8 +34,8 @@ apiVersion: rbac.authorization.k8s.io/v1beta1
 metadata:
   name: awx-pod-manager
 subjects:
-- kind: ServiceAccount
-  name: awx
+  - kind: ServiceAccount
+    name: awx
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role