[libvirt] network down lead vm been shutdown

[yue]

hi,all
the connection between remote-viewer and guest is good, now unplug Network Cable, wait several minutes, then kill virt-viewer.
now guest will be shutdwn.
---winxp.log of libvirt----------
handle_dev_display_connect: connect
handle_new_display_channel: add display channel client
handle_new_display_channel: New display (client 0x7f1cbf9f6ed0) dcc 0x7f1c584db2b0 stream 0x7f1cbfd61560
handle_new_display_channel: jpeg disabled
handle_new_display_channel: zlib-over-glz disabled
listen_to_new_client_channel: NEW ID = 0
display_channel_client_wait_for_init: creating encoder with id == 0
reds_handle_read_link_done: spice channels 3 should be encrypted
reds_handle_auth_mechanism: Auth method: 1
reds_show_new_channel: channel 3:0, connected successfully, over Secure link
inputs_connect: inputs channel client create
flush_display_commands: update timeout
red_channel_client_disconnect: 0x7f1c584db2b0 (channel 0x7f1c580458d0 type 2 id 0)
display_channel_client_on_disconnect:
validate_surface: failed on 13
validate_surface: panic !worker->surfaces[surface_id].context.canvas
2013-05-02 09:00:16.717+0000: shutting down
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