[WIP] Deis-Skydns / Dns Service Discovery

basic unit + deisctl integration to be started as part of platform install

ill squash the commits later on


- [x] create the skydns service as global unit 
- [x] add it to install plattform
- [x] have the registry register it self inside skdyns
- [ ] change the fleet scheduler to work with the dns based registry
- [ ] change the fleet scheduler to publish the app as local dns
- [ ] change nginx templates use dns for the reverse proxy


jenkins please !