[libvirt] [PATCH] Fix macvtap device tear down problem on virsh destroy

[Stefan Berger]

This patch fixes the problem with the tear down of the macvtap device
when issuing a 'virsh destroy' by moving the tear down block past the
point of killing the Qemu process. It seems necessary to loop at least
once in the case of 'virsh destory' since the device seems to be busy
for a while after the Qemu process has been killed. This also still
properly tears down the macvtap device when the VM is 'virsh shutdown'ed
or halted from inside.

Signed-off-by: Stefan Berger <stefanb at us.ibm.com>

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