make the base image be based on centos

Issue-ID: TEST-211
Change-Id: I5020abe6d1c93728cfd3211c42392c40db999919
Signed-off-by: DR695H <dr695h@att.com>
diff --git a/jjb/testsuite/testsuite-python-testing-utils.yaml b/jjb/testsuite/testsuite-python-testing-utils.yaml
index 9a40df1..0c8760e 100644
--- a/jjb/testsuite/testsuite-python-testing-utils.yaml
+++ b/jjb/testsuite/testsuite-python-testing-utils.yaml
@@ -19,7 +19,7 @@
     mvn-settings: 'testsuite-python-testing-utils-settings'
     files: '**'
     archive-artifacts: ''
-    build-node: 'ubuntu1604-builder-4c-4g'
+    build-node: 'centos7-builder-4c-4g'
 
 - project:
     name: testsuite-python-testing-utils-verify