Test with 4c-4g build server

All jjb jobs defined by Jeremy for subprojects in this repo (python)
failed.  We suspect this was due to the particular build server 
(8c-8g) being used because these failures occured during pytest
phase and these tests pass when run by sonar job on 4c-4g server.
Hence making this change to test.

Change-Id: Idf0fa573cf2e6777c40a99523e9df209b818e8b3
Signed-off-by: Lusheng Ji <lji@research.att.com>
Issue-ID: DCAEGEN2-206
diff --git a/jjb/dcaegen2/dcaegen2-utils.yaml b/jjb/dcaegen2/dcaegen2-utils.yaml
index e065867..96b95bf 100644
--- a/jjb/dcaegen2/dcaegen2-utils.yaml
+++ b/jjb/dcaegen2/dcaegen2-utils.yaml
@@ -40,7 +40,7 @@
       deployAtEnd=true
     files: '**'
     archive-artifacts: ''
-    build-node: 'ubuntu1604-docker-8c-8g'
+    build-node: 'ubuntu1604-basebuild-4c-4g'
 - project:
     name: dcaegen2-utils-sonar
     jobs: