nspawn: Detect the outer_cgver once, and pass that around

Yes, the relevant functions in cgroup-util actually do cache the values
with static variables.  But passing it around as a value makes the flow
much nicer.  The symmetry of having both the inner and outer cg versions
as a CGroupUnified enum makes the code much easier to grok; this could be
done with cg_version(), but I still think this is more readable.

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