This is just a cosmetic commit, because shellinabox is redirecting
http url to https.

This leads to some bug, since cache-file is deleted
every buildout run.

This recipe was written in order to create a service which download a
file after the buildout run.

rootfs recipe is replaced by downloader recipe which is more generic.

Conflicts:
	component/libcap/buildout.cfg
	component/lxc/buildout.cfg

This is made to be compatible with modifications :
  - 377c6db729
  - a3370049ad
  - c26729e0425

This replace using slappartition name which is better.
Due to uuid4, collision probability is very low.

This is now provided by slapgrid-sr itself. There's no need to compile
it for the software (since it's not possible to compile it as non-root).

This is required in order to compile lxc.

This is needed in order to compile libcap2 which is required by LXC.