[debian/maintscripts] Remove code for old upstart-xbmc-bridge.py.
Remove wrong comment.
Remove old logrotate configuration file for /var/log/upstart-xbmc-bridge.log.
[WIP] 90% rewritten to an XBMC add-on.  Not tested.

Needs a XBMC patch to add onClean{Started,Finished} callbacks - will commit
later if it compiles successfully.