[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-dmaapclient.yaml b/jjb/dmaap/dmaap-messagerouter-dmaapclient.yaml
index 3e7ba92..8e0dbf6 100644
--- a/jjb/dmaap/dmaap-messagerouter-dmaapclient.yaml
+++ b/jjb/dmaap/dmaap-messagerouter-dmaapclient.yaml
@@ -32,10 +32,10 @@
           maven-versions-plugin: true
     project: 'dmaap/messagerouter/dmaapclient'
     stream:
+      - 'istanbul':
+          branch: 'istanbul'
       - 'honolulu':
           branch: 'honolulu'
-      - 'guilin':
-          branch: 'guilin'
     mvn-settings: 'dmaap-messagerouter-dmaapclient-settings'
     files: '**'
     archive-artifacts: ''