[debian] Update debian packaging (closes #16133259) - use dh_python, pybuild and debhelper>=9, - refactor and simplify the debian/rules, - rename binary packages (but cubicweb-ctl) to python-xxx - remove daemon handling stuff (initscripts...) from cubicweb-ctl (one should now use a standard WSGI delivery method),

Twisted < 16.0.0
requests
webtest
cubicweb-blog
cubicweb-file
cubicweb-tag