So that we publish ony once, not twice.

parts+= is a nightmare in buildout.

Only used in mariadb, thus not generic.

Directory creations, etc.

Set recipe, software-url, ...

Comments, trailing spaces, dead code

This is a squash merge of 'resiliency-testing' branch when
the HEAD of this branch was f725c81d7d69.

The merge was done by Antoine Catton.