bump buildbot.net zone serial number

* so we can actually deploy it
apply base role to ns1

* another option is to make 'dns' role depend on 'base'
fix the dns role

* no localhost -> introduce internal_ip and use it for rndc
  communication
* create the rndc config file (since we use a non-standard address)
* create the rndc key in a non-default location (prevents annoying
  warnings)
Merge pull request #42 from sa2ajj/dns-serial-bump

bump buildbot.net zone serial number