jail cleanup and updates

Merged Jesse Norell requested to merge jnorell/ispconfig3:update_jailkit into develop

This is feature complete, it needs testing/debugging any issues found, and when done remove a few temporary/excessive debugging messages.

It does not check/fix the passwd file as in #5344 (closed), but that can be addressed separately. An easy workaround for #5344 (closed) is to resync cron jobs.

Fixes #2140 (closed) Fixes #5028 (closed) Fixes #4878 (closed) Fixes #2946 (closed) Fixes #5736 (closed)

Edited by Jesse Norell

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