updating executor-node for voltha-publish jobs

Change-Id: Ibb785fd893a1da6a5ee4fb613d2fb371c5607961
diff --git a/jjb/voltha-publish.yaml b/jjb/voltha-publish.yaml
index 5df4226..e58a5ef 100644
--- a/jjb/voltha-publish.yaml
+++ b/jjb/voltha-publish.yaml
@@ -9,7 +9,7 @@
       - 'voltha-publish':
           project-regexp: 'voltha'
           branch-regexp: '^(master|voltha-1.6|voltha-1.7)$'
-          executor-node: 'imagebuilder'
+          executor-node: 'ubuntu16.04-basebuild-1c-2g'
           dependency-jobs: ''
 
 - job-template: