Updated the jjb for aai Istanbul

Issue-ID: AAI-3400
Signed-off-by: wr148d <wr148d@att.com>
Change-Id: Ie6a23c71eec316da11853c997e64eab6e100d9fe
diff --git a/jjb/aai/aai-logging-service.yaml b/jjb/aai/aai-logging-service.yaml
index a4fbaea..b5cf02f 100644
--- a/jjb/aai/aai-logging-service.yaml
+++ b/jjb/aai/aai-logging-service.yaml
@@ -19,8 +19,8 @@
           build-node: centos7-docker-8c-8g
     project: 'aai/logging-service'
     stream:
-      - 'guilin':
-          branch: 'guilin'
+      - 'istanbul':
+          branch: 'istanbul'
       - 'master':
           branch: 'master'
     mvn-settings: 'aai-logging-service-settings'