I am not sure this is the best list for this question. May be you
should ask
systemd guys.
Helpful soul on freeipa list pointed me to
https://bugzilla.redhat.com/show_bug.cgi?id=915912#c19
Summarized as: Running a service as a domain user will not be supported by systemd as
system users must be available without the network.
Solving this (one way or another) will be part of
https://fedorahosted.org/freeipa/ticket/4544. Whether there needs to be an sssd ticket or
not probably depends on the strategy selected to solve this problem.
Bryce
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