This allows to pull a configuration from the installed system
via bsdinstaller and then either boot into the LiveCD or install
the system again.  Especially useful in an upgrade scenario so
that the system is cleaned but all settings are preserved.

A one-port setup is essentially WAN-only.  The good thing is
the GUI attaches to the WAN port and is automatically reachable.
This helps with general testing of all things around builds.

While there, append a whitespace that has been missing for years.