[UCA-10] support correct MTU

Change-Id: Idfd7c2f067db9e554e4b2b7f348b4b951a4f6616
Signed-off-by: ChrisC <cc697w@intl.att.com>
diff --git a/docker-compose.yml b/docker-compose.yml
index d1f1e1b..cce4515 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,9 @@
 version: '2'
-
+networks:
+  default:
+    driver: bridge
+    driver_opts:
+      com.docker.network.driver.mtu: ${MTU}
 services:
   mariadb:
     image: mariadb:10.1.11
@@ -17,7 +21,6 @@
       options:
         max-size: "30m"
         max-file: "5"
-
   mso:
     image: ecomp/mso
     ports: