Increase build node size for sdnc/northbound

Increase size of build node for sdnc/northbound to correct out of
memory issue running Sonar scans.

Change-Id: I76cb1a9c5346fd1df598a10e9345e175abbe7c55
Issue-ID: CIMAN-98
Signed-off-by: Dan Timoney <dtimoney@att.com>
diff --git a/jjb/sdnc/sdnc-northbound.yaml b/jjb/sdnc/sdnc-northbound.yaml
index a467423..b6175ce 100644
--- a/jjb/sdnc/sdnc-northbound.yaml
+++ b/jjb/sdnc/sdnc-northbound.yaml
@@ -21,3 +21,4 @@
       deployAtEnd=true
     files: '**'
     archive-artifacts: ''
+    build-node: ubuntu1604-basebuild-4c-4g