Make osc-functional-devstack-tips actually use tips

The base job has tox_install_siblings: false - which we want. But
that means we need tox_install_siblings: true on the tips job.

While we're at it - add fetch-tox-output so that we have tox log files
in the fetched build output for easier verification of what wound up
installed.

Don't look for ResourceNotFound string in test

The string ResourceNotFound is not in the error string anymore. Look for
the text that is.

Depends-On: https://review.openstack.org/541033
Change-Id: Id6de1485bcafb41f238f3e74277094ce64a6acf4

.zuul.yaml

@@ -175,6 +175,7 @@
         s-object: false
         s-proxy: false
       tox_envlist: functional
+      tox_install_siblings: true
 
 - project-template:
     name: osc-tox-unit-tips

openstackclient/tests/functional/common/test_extension.py

@@ -105,7 +105,7 @@ class ExtensionTests(base.TestCase):
         try:
             self.openstack('extension show ' + name)
         except tempest_exc.CommandFailed as e:
-            self.assertIn('ResourceNotFound', str(e))
+            self.assertIn('No Extension found for', str(e))
             self.assertIn(name, str(e))
         else:
             self.fail('CommandFailed should be raised')

playbooks/osc-devstack/post.yaml

@@ -1,3 +1,4 @@
 - hosts: all
   roles:
+    - fetch-tox-output
     - fetch-subunit-output