fix(docker-registry): up timeout

Slow connections wouldn't pull the image in under 90 seconds.

Author: carmstrong

contrib/docker-registry/user-data

@@ -9,5 +9,6 @@ coreos:
       Description=Docker Registry server
 
       [Service]
+      TimeoutStartSec=10min
       ExecStartPre=/bin/sh -c "docker history registry:latest >/dev/null || docker pull registry:latest"
       ExecStart=/usr/bin/docker run --name docker-registry -e STORAGE_PATH=/registry -e SEARCH_BACKEND=sqlalchemy -p 5000:5000 registry:latest