Installer: quote password where it applies

Prior to this change, password having shell interpretable character
would break the installer (e.g '&', '(', etc... )

This commits rely on the `quote` filter from ansible to ensure those
password are properly quoted where it applies

Fixes: https://github.com/ansible/awx/issues/3943
Signed-off-by: Yanis Guenane <yguenane@redhat.com>

installer/roles/image_push/tasks/main.yml

@@ -3,7 +3,7 @@
   docker_login:
     registry: "{{ docker_registry }}"
     username: "{{ docker_registry_username }}"
-    password: "{{ docker_registry_password }}"
+    password: "{{ docker_registry_password | quote }}"
     reauthorize: yes
   when: docker_registry is defined and docker_registry_password is defined
   delegate_to: localhost