Sign CCSDK artifacts

Update JJB to sign CCSDK artifacts.

Change-Id: I0401497501c3d2e287c3dbead2151760e2b52a07
Issue-ID: CIMAN-234
Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>
diff --git a/jjb/ccsdk/sli-northbound.yaml b/jjb/ccsdk/sli-northbound.yaml
index 986e051..df87a7f 100644
--- a/jjb/ccsdk/sli-northbound.yaml
+++ b/jjb/ccsdk/sli-northbound.yaml
@@ -5,9 +5,11 @@
     jobs:
       - '{project-name}-{stream}-verify-java'
       - '{project-name}-{stream}-merge-java'
-      - gerrit-maven-stage
+      - gerrit-maven-stage:
+          build-node: centos7-builder-4c-4g
       - '{project-name}-{stream}-release-version-java-daily'
 
+    sign-artifacts: true
     project: 'ccsdk/sli/northbound'
     stream:
       - 'master':