Generalize a comment which was VLAN-specific.

The explanation in this comment was based around the VLAN network type.
Granted, right now we don't have any others, but this should be phrased
in a way that doesn't break abstraction boundaries. The `Network` class
should know nothing about VLANs (and it doesn't).
Merge pull request #311 from zenhack/generalize-comment

Generalize a comment which was VLAN-specific.
Add wsgi script, parameterize config.load().

Work towards running this behind apache. the config.load() change
is so we can have a global config file, rather than needed to look
in the local directory.
Merge pull request #322 from zenhack/wsgi-script

Add wsgi script, parameterize config.load().