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>

awx/playbooks/run_isolated.yml

@@ -13,17 +13,17 @@
   tasks:
     - name: synchronize job environment with isolated host
       synchronize:
-        copy_links: yes
+        copy_links: true
         src: "{{ src }}"
         dest: "{{ dest }}"
       when: ansible_kubectl_config is not defined
 
     - name: synchronize job environment with remote job container
       synchronize:
-        copy_links: yes
+        copy_links: true
         src: "{{ src }}"
         dest: "{{ dest }}"
-        set_remote_user: no
+        set_remote_user: false
         rsync_opts:
           - "--rsh=$RSH"
       environment:
@@ -51,4 +51,4 @@
         content: "{{secret}}"
         path: "{{src}}/env/ssh_key"
       when: key.stat.exists
-      no_log: True
+      no_log: true