remove setup-specific commands from init script
remove setup-specific commands from init script

Some setups require changing the resolv.conf, some other require adding
a dnsmasq configuration file, but I think we can all agree that the
docker IP can be fixed to 172.17.42.1 once and for all.

jngermon/dockerony,greg0ire/dockerony,greg0ire/dockerony,jngermon/dockerony,jngermon/dockerony,greg0ire/dockerony