cerbero: Remove cleanone command
cerbero: Remove cleanone command

Its name is confusing and it is not very useful.
Currently, cerbero doesn't track the list of files
it installs, so there is no way to properly uninstall
a recipe.

atsushieno/cerbero,nirbheek/cerbero,atsushieno/cerbero,atsushieno/cerbero,GStreamer/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,atsushieno/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero