Fewer parameters, one more dependency.

This reverts commit a3cf70c9.

This version forces h.r.download to clean its own mess in /tmp.

Won't create /opt/slapgrid/.npm anymore

Conflicts:
	component/apache-php/buildout.cfg
	component/git/buildout.cfg
	component/mariadb/buildout.cfg
	slapos/recipe/request.py
	software/drupal/instance.cfg
	stack/lamp/buildout.cfg
	stack/nbd.cfg

Also, stop referencing reference implicitly pulled parts.

ERP5 related test locations can be calculated by eggs:extra-paths, instead of globbing from all parts.

Parameters are not final yet, and must evolve to get something resilient to
frontend "movements" (ex: frontend machine dying and frontend being
re-allocated on another, or frontend being replaced by an instance from
another software release - as it will happen for upgrades).

Modifed from original version by Rafael in order to fix conflicts
on md5 of the files and changes on same file done in multiple branches.