Tweak to voltha-publish job

Change-Id: Ib7b3d13734338a4424f68600dfde93f4113c6a3b
diff --git a/jjb/pipeline/voltha-publish.groovy b/jjb/pipeline/voltha-publish.groovy
index d56eca7..ecd6f25 100644
--- a/jjb/pipeline/voltha-publish.groovy
+++ b/jjb/pipeline/voltha-publish.groovy
@@ -14,6 +14,7 @@
           scm: [$class: 'RepoScm', \
             manifestRepositoryUrl: "${params.manifestUrl}", \
             manifestBranch: "${params.manifestBranch}", \
+            manifestGroup: 'voltha', \
             currentBranch: true, \
             destinationDir: 'cord', \
             forceSync: true,