Let's use systemd for EPEL 7
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This merge request is automatically copied from !717 (merged) orginally made by @ellert
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Moving from sys-V to systemd is disruptive and should normally not be done within a stable OS release, but since the ARC5 to ARC6 update is disruptive anyway doing this should be OK, I think. It should be done before the final release though.
I asked on the ARC 6 suppord chat for feedback and so far got noone against it, and one (Andrej) in favour.