Add network config info for host local IP address

By default, the guest machine is accessed by the host machine via
192.168.50.4.  Instead, we want to make the guest machine accessible
from the host machine's IP address.  This will allow us to access the
guest machine from other devices on the network (e.g. a smart phone)

I had a lot of issues setting this up and think an example in the config file would be helpful.

However, if others aren't having issues with this setup, adding this information may be overkill.

See #442