[web/application] remove `path` argument from CubicwebPublisher methods Path can actually be accessed from `req` object. This allows to avoid duplicating this information. This cset prepares the next ones that aim at adding the language as a prefix of the relative path.

usr/lib/python2*/*-packages/cubicweb/dataimport/
usr/lib/python2*/*-packages/cubicweb/server/
usr/lib/python2*/*-packages/cubicweb/hooks/
usr/lib/python2*/*-packages/cubicweb/sobjects/
usr/lib/python2*/*-packages/cubicweb/schemas/
usr/share/cubicweb/migration/