[CI] Add Istanbul branches to jobs

# Disabling all mirrormaker jobs

Change-Id: Ibd423b3b266eeef9dbadfc473dda27246da4a294
Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Issue-ID: CIMAN-411
diff --git a/jjb/dmaap/dmaap-messagerouter-messageservice.yaml b/jjb/dmaap/dmaap-messagerouter-messageservice.yaml
index 8f62a7c..9fb9ed2 100644
--- a/jjb/dmaap/dmaap-messagerouter-messageservice.yaml
+++ b/jjb/dmaap/dmaap-messagerouter-messageservice.yaml
@@ -38,10 +38,10 @@
           container-staging-registry: 'nexus3.onap.org:10003'
     project: 'dmaap/messagerouter/messageservice'
     stream:
+      - 'istanbul':
+          branch: 'istanbul'
       - 'honolulu':
           branch: 'honolulu'
-      - 'guilin':
-          branch: 'guilin'
     mvn-settings: 'dmaap-messagerouter-messageservice-settings'
     files: '**'
     archive-artifacts: ''