Add post step to Tempest base job

Stage three tempest conf and log files for archival using the
stage-output role.

Depends-on: Id45a50821539985710da7172a9185fd91e803603
Change-Id: Id67dbf3df5af52e848b8d378bc13aaa1c02cdd29

.zuul.yaml

@@ -11,6 +11,7 @@
       devstack_services:
         tempest: True
     run: playbooks/devstack-tempest.yaml
+    post-run: playbooks/post-tempest.yaml
 
 - project:
     name: openstack/tempest

playbooks/post-tempest.yaml

@@ -0,0 +1,16 @@
+- hosts: all
+  become: true
+  vars:
+    logs_root: "{{ devstack_base_dir|default('/opt/stack') }}"
+    stage_dir: "{{ devstack_base_dir|default('/opt/stack') }}"
+  roles:
+    - role: stage-output
+      zuul_copy_output:
+        { '{{ logs_root }}/tempest/etc/tempest.conf': 'logs',
+          '{{ logs_root }}/tempest/etc/accounts.yaml': 'logs',
+          '{{ logs_root }}/tempest/tempest.log': 'logs' }
+      extensions_to_txt:
+        - conf
+        - log
+        - yaml
+        - yml