[#48737855] Add internal DNS
This gives me the ability to do the following:
    vagrant@ci-master-1:~$ dig ci-slave-1
    172.16.11.11

    vagrant@ci-master-1:~$ dig +short slave
    172.16.11.12
    172.16.11.11
    vagrant@ci-master-1:~$ dig +short master
    172.16.11.10