Use central-cp-multi-upfs as default ngic branch for OMEC CI testing

Change-Id: I92b6f08d2bb2b64bded8e1e0a0df56281941efcd
diff --git a/jjb/omec-ci.yaml b/jjb/omec-ci.yaml
index 0a75009..fb0ce6c 100644
--- a/jjb/omec-ci.yaml
+++ b/jjb/omec-ci.yaml
@@ -43,7 +43,7 @@
           mme-repo: 'openmme'
       - 'omec-install':
           sub-project: '{name}'
-          branch: 'master'
+          branch: 'central-cp-multi-upfs'
           pipeline-file: 'Jenkinsfile-omec-install-ngic-rtc-vnf.groovy'
       - 'omec-fossa':
           pipeline-file: 'omec-fossa-scan.groovy'