Bosh Lite require xip to resolve cf routes internally

[bonzofenix]

I encounter this issue while trying to apply a bosh errand that interacts with cf. This makes bosh-lite with CF internet dependant. To achieve full offline setup for cf and bosh-lite dnsmask should run outside the vm and within the vm. I tried using the host machine as a dns server for the bosh-lite-vm but i could not make it work. I am willing to generate a Pull request on this and a way to introduce though config entries to the dnsmask configuration. Before starting working on this I want to know if this is something that I can expect to get merge. If thats the case I will start working right away.

[cppforlife]

How would this affect default bosh-lite configuration when internet is available? Or are you just proposing a PR around documenting how this can be configured?