Collect logs from testing

It is helpful to collect logs / config files after testing.

Change-Id: Ide854f94a5057c754ebbc4a0dac24b5f8b6e91d6
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -1,6 +1,7 @@
 - job:
     name: ansible-role-zuul
     run: tests/test.yaml
+    post-run: tests/collect-logs.yaml
     required-projects:
       - name: openstack-infra/zuul
     roles:

tests/collect-logs.yaml

@@ -0,0 +1,16 @@
+- hosts: all
+  tasks:
+    - name: Ensure logs directory exists
+      file:
+        path: "{{ zuul.executor.log_root }}/logs"
+        state: directory
+      delegate_to: localhost
+
+    - name: Collect zuul log files
+      synchronize:
+        dest: "{{ zuul.executor.log_root }}/logs"
+        mode: pull
+        rsync_opts:
+          - "--relative"
+        src: /var/log/zuul
+        verify_host: true