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A better implementation would be at libslap level (so that it works for
slapconsole too, for example), but requires too ugly hacks to accomodate
current data structure compared to change's otherwise (lack of) complexity.

Based on work by Romain Courteaud <romain@nexedi.com>.

(cherry picked from commit 937fcca5)

Add back egg_test recipe

This recipe was colliding with slapos.recipe.template
recipe.

Moreover, this is useless since slapos.recipe.template provide
the same functionality.

(cherry picked from commit d1e1a328)

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.