Do not run reset_connection meta with buildah

reset_connection is not needed when running container
build with buildah.

reset_conneciton doesn't work[1] with when condition and has
different behavior with different ansible versions:-
- With ansible-2.5.15:- Fatal error
- With ansible-2.7:- Warning

Since the ansible version in RDO zuul is still 2.5 we
need to workaround by moving the meta task to different
play and include it in the main playbook.

[1] https://github.com/ansible/ansible/issues/46275

Change-Id: Id6bbf0da1c504dcf1bb09c9435c92e0f18c7c06b

roles/build-containers/tasks/pre.yaml

@@ -35,8 +35,8 @@
       shell: |
         ansible-playbook docker-playbook.yaml --extra-vars "container_registry_deployment_user={{ ansible_user }}"
 
-    - name: Reset connection because of group changes for current user
-      meta: reset_connection
+    - include_tasks: reset_connection.yaml
+      when: not use_buildah | default(false) | bool
 
     - name: Prepare Buildah
       become: true

roles/build-containers/tasks/reset_connection.yaml

@@ -0,0 +1,3 @@
+---
+- name: Reset connection because of group changes for current user
+  meta: reset_connection