adding a in-between parameter for onos-tag

Change-Id: I80dc92a403c6f32c51c937b73967ab96ec7211ef
diff --git a/jjb/onos/onos-verify.yaml b/jjb/onos/onos-verify.yaml
index 7606440..92e5e2e 100644
--- a/jjb/onos/onos-verify.yaml
+++ b/jjb/onos/onos-verify.yaml
@@ -265,6 +265,8 @@
 
     concurrent: true
 
+    onos-tag: 'latest'
+
     parameters:
       - lf-infra-parameters:
             project: '{project}'
@@ -274,7 +276,7 @@
 
       - string:
             name: ONOS_TAG
-            default: ''
+            default: '{onos-tag}'
             description: 'Tag of ONOS to build'
 
     scm:
@@ -871,7 +873,7 @@
 
       jobs:
           - 'onos-{stream}-docker-merge-build':
-              ONOS_TAG: 'latest'
+              onos-tag: 'latest'
               disabled: true
 
 - project:
@@ -888,7 +890,7 @@
 
       jobs:
           - 'onos-{stream}-docker-merge-build':
-              ONOS_TAG: '{stream}-latest'
+              onos-tag: '{stream}-latest'
               disabled: true
 - project:
       name: onos-snapshot