vm: 'system-disk-image' no longer requires the OS to define the "/" file system.

Previously 'guix system disk-image' would fail if the OS didn't define a
"/" file system, even though it actually overrides that file system.

* gnu/system/vm.scm (system-disk-image)[root-uuid]: Turn into a
procedure.
Call 'root-uuid' on a variant of OS with a "/" file system and inherit
from that.

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