[debian] Add a python3-disco-master package.
[debian] Add a python3-disco-master package.

This is a hack; ideally we should be able to control the dependencies
of disco-master to choose python-disco or python3-disco using env
variables.  However, this is left as an exercise for people with
superior debian-fu.

discoproject/disco,mwilliams3/disco,ErikDubbelboer/disco,ktkt2009/disco,mozilla/disco,oldmantaiter/disco,discoproject/disco,pooya/disco,pombredanne/disco,beni55/disco,oldmantaiter/disco,ErikDubbelboer/disco,seabirdzh/disco,mwilliams3/disco,oldmantaiter/disco,pombredanne/disco,ktkt2009/disco,oldmantaiter/disco,ErikDubbelboer/disco,simudream/disco,ktkt2009/disco,seabirdzh/disco,beni55/disco,seabirdzh/disco,simudream/disco,ErikDubbelboer/disco,pooya/disco,discoproject/disco,discoproject/disco,beni55/disco,mozilla/disco,simudream/disco,seabirdzh/disco,ktkt2009/disco,seabirdzh/disco,pombredanne/disco,ktkt2009/disco,simudream/disco,mwilliams3/disco,beni55/disco,beni55/disco,mozilla/disco,simudream/disco,pooya/disco,pombredanne/disco,ErikDubbelboer/disco,pombredanne/disco,discoproject/disco,mwilliams3/disco,pooya/disco,mwilliams3/disco,oldmantaiter/disco,mozilla/disco