Run self-release on centos

Update self-release jobs to run on centos build node instead of
ubuntu

Change-Id: Iffee853a96b1b8c187d1c9db4a7b42edb1bc7c3e
Issue-ID: CIMAN-286
Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>
diff --git a/jjb/ccsdk/platform-plugins.yaml b/jjb/ccsdk/platform-plugins.yaml
index 67058a7..e9b6ebd 100644
--- a/jjb/ccsdk/platform-plugins.yaml
+++ b/jjb/ccsdk/platform-plugins.yaml
@@ -8,7 +8,8 @@
       - gerrit-maven-stage:
           build-node: centos7-builder-4c-4g
           sign-artifacts: true
-      - '{project-name}-gerrit-release-jobs'
+      - '{project-name}-gerrit-release-jobs':
+          build-node: centos7-builder-4c-4g
 
     project: 'ccsdk/platform/plugins'
     stream: