Switch to collect-container-logs

This change switches the post bits to use a new centralized
role to collect all container logs.

Depends-On: https://review.opendev.org/701867
Change-Id: I74209fe9b2294709bbef37560d93d63a86c36a10

playbooks/functional-test/post.yaml

@@ -1,17 +1,3 @@
 - hosts: all
-  tasks:
-    - name: List containers
-      command: "docker ps -a --format '{{ '{{ .Names }}' }}'"
-      register: docker_containers
-      ignore_errors: true
-
-    - name: Create container log dir
-      file:
-        path: "{{ ansible_user_dir }}/zuul-output/logs/docker"
-        state: directory
-
-    - name: Save container logs
-      loop: "{{ docker_containers.stdout_lines | default([]) }}"
-      shell: "docker logs {{ item }} &> {{ ansible_user_dir }}/zuul-output/logs/docker/{{ item }}.txt"
-      args:
-        executable: /bin/bash
+  roles:
+    - collect-container-logs