VOL-612 - rename images to work better with public repository

Change-Id: I9679544987c3a08d0001928cfbc39d710a6c1eae
diff --git a/compose/docker-compose-kafka-cluster.yml b/compose/docker-compose-kafka-cluster.yml
index 53fd141..0dc837e 100644
--- a/compose/docker-compose-kafka-cluster.yml
+++ b/compose/docker-compose-kafka-cluster.yml
@@ -23,7 +23,7 @@
                max-size: "10m"
                max-file: 3
         networks:
-            - net
+            - kafka-net
         environment:
             ZOO_MY_ID: 1
             ZOO_SERVERS: server.1=0.0.0.0:2888:3888 server.2=zk2:2888:3888 server.3=zk3:2888:3888
@@ -36,7 +36,7 @@
                 max-size: "10m"
                 max-file: 3
         networks:
-            - net
+            - kafka-net
         environment:
             ZOO_MY_ID: 2
             ZOO_SERVERS: server.1=zk1:2888:3888 server.2=0.0.0.0:2888:3888 server.3=zk3:2888:3888
@@ -49,7 +49,7 @@
                 max-size: "10m"
                 max-file: 3
         networks:
-            - net
+            - kafka-net
         environment:
             ZOO_MY_ID: 3
             ZOO_SERVERS: server.1=zk1:2888:3888 server.2=zk2:2888:3888 server.3=0.0.0.0:2888:3888
@@ -70,16 +70,15 @@
         volumes:
             - /var/run/docker.sock:/var/run/docker.sock
         networks:
-            - net
+            - kafka-net
             - voltha-net
         ports:
             - 9092:9092
 
 networks:
-    net:
-        driver: overlay
-        driver_opts:
-           encrypted: "true"
+    kafka-net:
+        external:
+            name: kafka_net
 
     voltha-net:
         external: