extend cobblersystems defaults with interface config
extend cobblersystems defaults with interface config

We inherit from kvmhost to have easy access to the IPv6 address, then
proceed to generate the default configuration for our systems' eth0
interface, as that is very consistent.
This should enable us to create much smaller data-sets to define a VM
This commit fixes #1

Brainsware/puppet-kvmhost,Brainsware/puppet-kvmhost,Brainsware/puppet-kvmhost