Currently for most of the import/export scripts of resiliency we still use bash scripts, which are directly rendered by slapos using jinja2 templates. This is an extremely bad practice, as it makes writing tests for these scripts infinitely impractical. Also, bash is a language that very few people can use properly. For exemple, I already saw this kind of things :

- grep ...

if [ $? -eq 0 ] 

(if you don't understand, that proves my point).

This combined to the current lack of tests make the resiliency stack untrustable.

This MR has the purpose to put the first stone on the road of cleaning this situation, by replacing the runner-exorpter script in bash by python, a scripting language mastered by everyone in Nexedi, and by stopping using scripts rendered as jinja templates.

This MR depends on slapos.toolbox!44 (merged)