Support for public networks

[fgrehm]

http://docs.vagrantup.com/v2/networking/public_network.html

[cwoac]

So, I was/am thinking about doing a patch for this; As I see it, the problem is basically one of choosing / setting the correct bridge target in the config file for the vagrant.
Currently this is (in the configs) hard coded to lxcbr0; I'm trying to think what would be the most vagrant-y way of doing it. The (simplest) way would be to pick another default (lxcbr1? br0?) and have it override/handle the network "public_network" config option with a function that mangles the lxc.conf.

It would be nice if these could be specified by the user in a config variable, but I'm not sure if that would be appropriate / feasible.

This won't do anything special for wireless users, but it should be a decent start.

What do you think?

[fgrehm]

@cwoac as I said on other issues my networking skills are close to zero and I need to think about it. I've gotta fix some bugs related to 0.6.0 and will get back to networking after that :)

[fgrehm]

Closing as it is not a feature that has had enough interest (private networks have a higher priority ATM), I'd look into a PR though.