The captive portal daemon was written with v3.x of CherryPy in mind and
not v2.x, which means that it uses a few plugins that don't exist in the
earlier rev.  In Debian, python-cherrypy3 means "CherryPy v3 for the
default Python build" and not "CherryPy for python3."  So, I updated the
dependency, built a package, and tested it in a VM.  It works now.

Signed-off-by: The Doctor <drwho@virtadpt.net>