Code review comment for lp:~gandelman-a/ubuntu/precise/cobbler-enlist/868492

To be clear, the default behavior after this patch is to register ALL valid interfaces+mac addrs on the system. If one or multiple interfaces is specified on the command line, those (and only those) interfaces+macaddrs will be registered.

It seems we're still determining how best to gather system information and post back. This change set provides the necessary internals to register multiple NICs + mac addrs, which is something that will be desired regardless of how decide to gather them. I predict we'll move from obtaining mac addrs via ioctl() to parsing it outside of cobbler-enlist. While the front end argv handling will likely change over time, the internal enlister->netifs changes here (which is the bulk of the patch) should meet our needs regardless.