Create jobs to verify changes to scenarios

Currently only commit message based scenario determination is
in place. Determining the scenario based on the changed files
is yet to be implemented.

The scripts and the jobs will be refactored to increase the
reuse and reduce the duplication once the basic scenario verification
is working.

Change-Id: I4b936c955828f34f263e9825a465bba25e4688c1
diff --git a/jjb/cloud-infra/cloud-infra-periodic-engine.yaml b/jjb/cloud-infra/cloud-infra-periodic-engine.yaml
index 97c2306..5cf2eac 100644
--- a/jjb/cloud-infra/cloud-infra-periodic-engine.yaml
+++ b/jjb/cloud-infra/cloud-infra-periodic-engine.yaml
@@ -138,6 +138,7 @@
           use-build-blocker: true
           blocking-jobs:
             - 'cloud-infra-verify-engine-{os}-.*'
+            - 'cloud-infra-verify-scenario-{os}-.*'
             - 'cloud-infra-periodic-engine-{os}-.*'
             - 'cloud-infra-os-.*'
             - 'cloud-infra-k8-.*'