[libvirt] [PATCH] fix detach-disk for inactive xen domains

[Jim Fehlig]

detach-disk was not working for inactive xen domains due to lookup of
device ID from xenstore.  When detaching disks there is no need to use
device id as device name can be used directly.  Unfortunately that same
is not true for network devices.  In fact, AFAICT, there is no way to
"hot unplug" a network device from inactive domain using xen tools.

I have tested attaching/detaching disks to/from both active and inactive
domains.  I've also ensured no regressions in attaching/detaching
network devices on active domains and attaching network devices on
inactive domains.  As noted above, detaching network devices from
inactive domains does not work, but I'm not sure what we can do about
that since xen tools themselves don't support this.  Any suggestions are
kindly welcomed.  Oh, and I also ensured all of these scenarios work
with both PV and HVM domains.

Regards,
Jim

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