cloud-infra: Add periodic jobs to verify the stability

Change-Id: I3d96126b6a6da5655fd6612ef5b01a6672c9bab3
diff --git a/jjb/cloud-infra/cloud-infra-verify-engine.yaml b/jjb/cloud-infra/cloud-infra-verify-engine.yaml
index 5dced57..922bdfb 100644
--- a/jjb/cloud-infra/cloud-infra-verify-engine.yaml
+++ b/jjb/cloud-infra/cloud-infra-verify-engine.yaml
@@ -126,6 +126,7 @@
           use-build-blocker: true
           blocking-jobs:
             - 'cloud-infra-verify-engine-{os}-.*'
+            - 'cloud-infra-periodic-engine-{os}-.*'
             - 'cloud-infra-os-.*'
             - 'cloud-infra-k8-.*'
           block-level: 'NODE'