use entry_points for binscripts

The binscripts can be generated using entry_points/console_scripts in the setup.cfg. This means the binscripts should contain no real code, and the code can be moved to trove/cmd. This is where the other projects store their entry_points for their binscripts. This also means its easier to test the binscripts since they are in the source tree now.

** One thing to note is that the guest, since its going to be installed differently and moved, will not participate in this. the guest binscript will be moved into contrib/ so it can be run in the image build.