qemu_driver: always check whether iothread is used by disk or not
If virDomainDelIOThread API was called with VIR_DOMAIN_AFFECT_LIVE
and VIR_DOMAIN_AFFECT_CONFIG and both XML were already a different
it could result in removing iothread from config XML even if there
was a disk using that iothread.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
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