This parameter is only consumed by nova-compute.
In packstack this causes problem, when compute and
controller are located on the same node and this
parameter is set to: http://0.0.0.0:6080/vnc_auto.html
Thus this compute node returns incorrect novnc url.
Change-Id: I03c6329d805081cfc29aa640bbacbdba2c899422
Signed-off-by: Pavel Glushchak <pglushchak@virtuozzo.com>