[Libvir] <disk> <shareable/> has no effect

[Markus Armbruster]

Looks like <shareable/> within <disk> has no effect.  I ran virsh
dumpxml, inserted the <shareable/>, redefined the domain, and ran
virsh dumpxml again.  No shareable.  I even ran virsh undefine and
virsh define again, same thing.

XML and output of xm list --long for this guest attached.

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