VOL-406 add logging configuration to swarm stack files

Change-Id: I6e75649c6f1cef3948437e59c778c562c828badc
diff --git a/compose/docker-compose-netconf-swarm.yml b/compose/docker-compose-netconf-swarm.yml
index ed39a27..3259c47 100644
--- a/compose/docker-compose-netconf-swarm.yml
+++ b/compose/docker-compose-netconf-swarm.yml
@@ -14,6 +14,11 @@
 services:
   netconf:
     image: cord/netconf:latest
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: 3
     deploy:
       mode: global
     environment: