Collect mailman logs in deployment testing

Get the logs from the test mailman deployments for inspection in
build results.

Change-Id: I68ea634d6048691bf14a573e66983038bc485f3c

playbooks/zuul/run-lists-post.yaml

@@ -0,0 +1,11 @@
+- hosts: lists.openstack.org
+  tasks:
+    - name: Collect per-site mailman log directories
+      shell:
+        cmd: |
+          mkdir -p /var/log/mailman
+          for logs in /srv/mailman/*/logs ; do
+              cp -a $logs /var/log/mailman/$(basename $(dirname $logs))
+          done
+      become: yes
+      ignore_errors: true

zuul.d/system-config-run.yaml

@@ -233,6 +233,7 @@
     parent: system-config-run
     description: |
       Run the playbook for a list server.
+    post-run: playbooks/zuul/run-lists-post.yaml
     nodeset:
       nodes:
         - name: bridge.openstack.org
@@ -255,11 +256,19 @@
       - playbooks/zuul/templates/host_vars/lists.katacontainers.io.yaml.j2
       - testinfra/test_lists_k_i.py
       - testinfra/test_lists_o_o.py
+      - playbooks/zuul/run-lists-post.yaml
     vars:
       run_playbooks:
         - playbooks/service-lists.yaml
         # Run this twice to check idempotency
         - playbooks/service-lists.yaml
+    host-vars:
+      lists.katacontainers.io:
+        host_copy_output:
+          '/var/log/mailman': logs
+      lists.openstack.org:
+        host_copy_output:
+          '/var/log/mailman': logs
 
 - job:
     name: system-config-run-nodepool