k8-calico-spinnaker: Do not use dot in version

Change-Id: I61661d99104b8b5b65d2643e93e527d2ab7ddd10
diff --git a/jjb/cloud-infra/cloud-infra-periodic-spinnaker.yaml b/jjb/cloud-infra/cloud-infra-periodic-spinnaker.yaml
index 62c9b58..6ecbaec 100644
--- a/jjb/cloud-infra/cloud-infra-periodic-spinnaker.yaml
+++ b/jjb/cloud-infra/cloud-infra-periodic-spinnaker.yaml
@@ -35,7 +35,7 @@
           daily-trigger: '@midnight'
 
     spinnaker-branch:
-      - '1.16':
+      - '1_16':
           nordix-branch: master
           engine-version: master
           engine-refspec: master