Draft: Kali updates

Arnaud Rebilloutrequested to merge
arnaudr/pipeline:kali into master

This MR brings some updates to Kali Linux settings. The most outstanding is that Kali is now using it's own Docker images, rather than using debian:testing and converting it to a Kali system. To support non-Debian Docker images, there was some minor changes needed: this is commit arnaudr/pipeline@ed898f37

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