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_collection/template_galaxy.yml

@@ -1,3 +1,4 @@
+---
 - hosts: localhost
   gather_facts: false
   connection: local
@@ -7,28 +8,28 @@
     collection_version: 0.0.1  # not for updating, pass in extra_vars
 
   tasks:
-  - name: Do file content replacements for non-default namespace or package name
-    block:
-    - name: Find all module files
-      find:
-        paths: "{{ playbook_dir }}/plugins/modules"
-        patterns: "*.py"
-      register: module_files
+    - name: Do file content replacements for non-default namespace or package name
+      block:
+        - name: Find all module files
+          find:
+            paths: "{{ playbook_dir }}/plugins/modules"
+            patterns: "*.py"
+          register: module_files
 
-    - name: Change files to support desired namespace and package names
-      replace:
-        path: "{{ item.path }}"
-        regexp: '^extends_documentation_fragment: awx.awx.auth$'
-        replace: 'extends_documentation_fragment: {{ collection_namespace }}.{{ collection_package }}.auth'
-      with_items: "{{ module_files.files }}"
+        - name: Change files to support desired namespace and package names
+          replace:
+            path: "{{ item.path }}"
+            regexp: '^extends_documentation_fragment: awx.awx.auth$'
+            replace: 'extends_documentation_fragment: {{ collection_namespace }}.{{ collection_package }}.auth'
+          with_items: "{{ module_files.files }}"
 
-    - name: Change files to support desired namespace and package names
-      replace:
-        path: "{{ playbook_dir }}/plugins/inventory/tower.py"
-        regexp: "^    NAME = 'awx.awx.tower'  # REPLACE$"
-        replace: "    NAME = '{{ collection_namespace }}.{{ collection_package }}.tower'  # REPLACE"
-    when:
-      - (collection_package != 'awx') or (collection_namespace != 'awx')
+        - name: Change files to support desired namespace and package names
+          replace:
+            path: "{{ playbook_dir }}/plugins/inventory/tower.py"
+            regexp: "^    NAME = 'awx.awx.tower'  # REPLACE$"
+            replace: "    NAME = '{{ collection_namespace }}.{{ collection_package }}.tower'  # REPLACE"
+      when:
+        - (collection_package != 'awx') or (collection_namespace != 'awx')
 
-  - name: Template the galaxy.yml file
-    template: src={{ playbook_dir }}/galaxy.yml.j2 dest={{ playbook_dir }}/galaxy.yml
+    - name: Template the galaxy.yml file
+      template: src={{ playbook_dir }}/galaxy.yml.j2 dest={{ playbook_dir }}/galaxy.yml