VOL-406 add logging configuration to swarm stack files

Change-Id: I6e75649c6f1cef3948437e59c778c562c828badc
(cherry picked from commit 4e920b7e69587ac2395f4069bfa5ed298bbeb2c5)
diff --git a/compose/docker-compose-ofagent-swarm.yml b/compose/docker-compose-ofagent-swarm.yml
index dee18cc..7342114 100644
--- a/compose/docker-compose-ofagent-swarm.yml
+++ b/compose/docker-compose-ofagent-swarm.yml
@@ -10,6 +10,11 @@
 services:
     ofagent:
         image: cord/ofagent
+        logging:
+           driver: "json-file"
+            options:
+                max-size: "10m"
+                max-file: 3
         deploy:
             replicas: 3
         entrypoint: