[virtual interface] detach interface during boot succeed with no changes

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Hi guys,

when I detach an interface from vm during boot (vm boot not finished), it
always fail. I'm not sure if there is an existing bug. I have
confirmed with someone that for disk, there is similar behavior, if
this is also acceptable?

# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2;  virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed

Domain rhel7.2 started

Interface detached successfully

      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:98:c4:a0'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='rtl8139'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>

When I detach after the vm boot, expand the sleep time to 10, it will succeed.

# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10;  virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed

Domain rhel7.2 started

Interface detached successfully


-------
Best Regards,
Yalan Zhang
IRC: yalzhang
Internal phone: 8389413

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