Natpatches

1. Get rid of the "true" which breaks cobbler late commands and will throw things into an infinite install loop. There's a PR at https://github.com/CiscoSystems/puppet-cobbler/pull/30 which will make this relevant for Grizzly, though at the moment the Puppetfile is pulling down a fork of the folsom branch of cobbler with an equivalent change already in there, so we need this right now even without that being merged.

2. Natting works for me via the build node, but DNS doesn't without changing the resolv.conf on each VM. I'm not 100% sure where the config for this goes in nova/quantum. I like this on the build node as opposed to cache because cache probably won't be a part of everybody's system and I want to support running without it being instantiated for every environment I spin up.