[pkg] Drop NO_SETUPTOOLS option setuptools is the defacto standard nowadays. The only place where NO_SETUPTOOLS option was used is during packaging (RPM, Debian) and even in this context, it seems that setuptools is the way to go (see https://wiki.debian.org/Python/LibraryStyleGuide).

#!/usr/bin/make -f

%:
	dh $@ --with python2

override_dh_python2:
	dh_python2 -i /usr/share/cubicweb