update-debsources: get rid of no longer used globals
update-debsources: get rid of no longer used globals

also, simplify import logic

matthieucan/debsources,oorestisime/debsources,vivekanand1101/debsources,vivekanand1101/debsources,zacchiro/debsources,zacchiro/debsources,oorestisime/debsources,Debian/debsources,nonas/debian-qa,Debian/debsources,clemux/debsources,devoxel/debsources,sophiejjj/debsources,vivekanand1101/debsources,oorestisime/debsources,matthieucan/debsources,devoxel/debsources,nonas/debian-qa,Debian/debsources,zacchiro/debsources,sophiejjj/debsources,nonas/debian-qa,zacchiro/debsources,nonas/debian-qa,matthieucan/debsources,clemux/debsources,vivekanand1101/debsources,oorestisime/debsources,zacchiro/debsources,matthieucan/debsources,devoxel/debsources,Debian/debsources,sophiejjj/debsources,Debian/debsources,devoxel/debsources,sophiejjj/debsources,matthieucan/debsources,clemux/debsources,devoxel/debsources,sophiejjj/debsources,clemux/debsources,oorestisime/debsources,clemux/debsources,vivekanand1101/debsources