CI namespace tests undeploys the "default" controller and service.

The test should run correctly without them, and leaving them
deployed may conceal potential bugs.

.gitlab-ci.yml

@@ -114,9 +114,14 @@ example:hello:
     - cd ../examples/hello
     - make deploy verify undeploy
 
+# undeploy the "default" controller and service, this example should
+# run correctly without them.
 example:namespace:
   extends: .integration-tests
   script:
+    - pushd ,/deploy
+    - make undeploy
+    - popd
     - cd ../examples/namespace
     - make deploy verify undeploy