Increaes instance size for portal

Change-Id: I45aaebb335cec436b2b822e7f2d03b542dc83d82
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>
diff --git a/jjb/portal/portal.yaml b/jjb/portal/portal.yaml
index 1aaa876..09e28eb 100644
--- a/jjb/portal/portal.yaml
+++ b/jjb/portal/portal.yaml
@@ -12,3 +12,4 @@
     mvn-settings: 'portal-settings'
     files: '**'
     archive-artifacts: ''
+    build-node: ubuntu1604-basebuild-4c-4g