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/image_build/tasks/main.yml

@@ -37,7 +37,7 @@
   shell: make clean
   args:
     chdir: ..
-  ignore_errors: yes
+  ignore_errors: true
   when: not sdist.stat.exists
   delegate_to: localhost
 
@@ -46,7 +46,7 @@
     build:
       path: "{{ role_path }}/files"
       dockerfile: Dockerfile.sdist
-      pull: no
+      pull: false
       args:
         http_proxy: "{{ http_proxy | default('') }}"
         https_proxy: "{{ https_proxy | default('') }}"
@@ -178,7 +178,7 @@
     build:
       path: "{{ docker_base_path }}"
       dockerfile: Dockerfile
-      pull: no
+      pull: false
       args:
         http_proxy: "{{ http_proxy | default('') }}"
         https_proxy: "{{ https_proxy | default('') }}"
@@ -186,7 +186,7 @@
     name: "{{ web_image }}"
     tag: "{{ awx_version }}"
     source: 'build'
-    force_source: yes
+    force_source: true
   delegate_to: localhost
 
 - name: Build base task image
@@ -194,7 +194,7 @@
     build:
       path: "{{ docker_base_path }}"
       dockerfile: Dockerfile.task
-      pull: no
+      pull: false
       args:
         http_proxy: "{{ http_proxy | default('') }}"
         https_proxy: "{{ https_proxy | default('') }}"
@@ -202,7 +202,7 @@
     name: "{{ task_image }}"
     tag: "{{ awx_version }}"
     source: 'build'
-    force_source: yes
+    force_source: true
   delegate_to: localhost
 
 - name: Tag task and web images as latest