[test] Simplify CWTC's init_authentication and assertAuthSuccess
which shouldn't rely on removed .session attribute while it's not necessary and
could be written in a simpler way.
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)
embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js