Integration testing for mirror info script

This adds a job to assert the mirror-info script is created correctly.

Change-Id: I56f7b1d6e94c81dceebb14d27ba4aa59e9874245

playbooks/integration-tests/main.yaml

@@ -0,0 +1 @@
+- include: mirror-info.yaml

zuul.yaml

@@ -138,12 +138,33 @@
        jobs:
          - trigger-readthedocs
 
+####
+# Testing of project-config roles
+####
+- job:
+    name: base-integration
+    description: |
+      Runs roles that are included by default in the 'base' job in order to
+      prevent regressions.
+    parent: base-minimal
+    roles:
+      - zuul: openstack-infra/project-config
+    run: playbooks/integration-tests/base
+
+- job:
+    name: base-integration-ubuntu-xenial
+    parent: base-integration
+    nodes:
+      - name: ubuntu-xenial
+        label: ubuntu-xenial
+
 - project:
     name: openstack-infra/openstack-zuul-jobs
     check:
       jobs:
         - openstack-doc-build
         - tox-linters
+        - base-integration-ubuntu-xenial
     gate:
       jobs:
         - openstack-doc-build