Cancel obsolete builds on reconfiguration

Cleanup running builds for jobs that are no longer defined on
reconfiguration.

Change-Id: I746a5ba8d9034ae846fd77080af2bfabc8aedf44
diff --git a/tests/fixtures/layout.yaml b/tests/fixtures/layout.yaml
index 98dfe86..b1c94de 100644
--- a/tests/fixtures/layout.yaml
+++ b/tests/fixtures/layout.yaml
@@ -231,3 +231,7 @@
       - conflict-project-merge:
         - conflict-project-test1
         - conflict-project-test2
+
+  - name: org/noop-project
+    gate:
+      - noop