Use right name and type for variable

Wrongly named variable, and type was missing too.
Remove systemd container control

This didn't work too well, easier to let docker
handle container start/stop
Set right mode to passwd file

vnc-server refused to use this if mode was incorrect
Link directories to volume

I want to have few directories to be persisted
over container recreations, so link them indirectories to volume
Make sure that jenkins -user owns home

Easiest thing to do.
Setup limits for host and containers

In fedora, there's file /etc/security/limits.d/90-nproc.conf
which sets process limits to pretty low:

  *          soft    nproc     1024

So just set unlimited for now.