949befd3f09e8c06a908ec99efd241666c21d944
This makes sure we migrate /var/lib/<foo> if it exists to /var/lib/private/<foo> if DynamicUser=1 is set. This is useful to allow turning on DynamicUser= on services that previously didn't use it, and we can deal with this, and migrate the relevant directories as necessary. Note that "downgrading" from DynamicUser=1 backto DynamicUser=0 works too. However in that case we simply continue to use /var/lib/private/<foo>, which works because /var/lib/<foo> is a symlink there after all.
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