DaanDeMeyer 852de7ed70 nspawn: Prepare --bind-user= logic for reuse in systemd-vmspawn
Aside from the usual boilerplate of moving the shared logic to shared/,
we also rework the implementation of --bind-user= to be similar to what
we'll do in systemd-vmspawn. Instead of messing with the nspawn container
user namespace, we use idmapped mounts to map the user's home directory on
the host to the mapped uid in the container.

Ideally we'd also use the "userdb.transient" credentials to provision the
user records, but this would only work for booted containers, whereas the
current logic works for non-booted containers as well.

Aside from being similar to how we'll implement --bind-user= in vmspawn,
using idmapped mounts also allows supporting --bind-user= without having to
use --private-users=.
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Systemd

System and Service Manager

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