swarm: docker dns already knows service names

[morph027]

The docker swarm stack also knows stack internal names without the stack name prepended:

root@docker-swarm-node-xxx:~# docker exec -it galera_seed.1.xxx /bin/bash
root@xxx:/# getent hosts seed   
10.0.10.2       seed
root@xxx:/# getent hosts galera_seed
10.0.10.2       galera_seed

Note: I've created an external network, that's why it's 10.0.10.0/24

[colinmollenhour]

Thanks!