Update CherryPy dependency package to python-cherrypy3 on Debian.

Update CherryPy dependency package to python-cherrypy3 on Debian.

Thanks to Tim Mazid for reporting the bug, and Israel Basurto for
suggesting the fix.

On Wed, May 09, 2012 at 07:26:14PM +1000, Tim Mazid wrote:
> $ interfaces/web/cfbe.py ~/projects/proj/
> Bugs Everywhere Directory v1.4
> Traceback (most recent call last):
>   File "interfaces/web/cfbe.py", line 42, in <module>
>     cherrypy.quickstart(WebInterface, '/', app_config)
> AttributeError: 'module' object has no attribute 'quickstart'
>
> This is with the latest be from git, and python-cherrypy 2.3.0-3 from
> Debian wheezy.