Due to dom0_vp open, we can enable VTi's network in configuration file now.
From: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@hp.com>
# Random MACs are assigned if not given.
#vif = [ 'type=ioemu, mac=00:16:3e:00:00:11, bridge=xenbr0' ]
# type=ioemu specify the NIC is an ioemu device not netfront
-#vif = [ 'type=ioemu, bridge=xenbr0' ]
+vif = [ 'type=ioemu, bridge=xenbr0' ]
# for multiple NICs in device model, 3 in this example
#vif = [ 'type=ioemu, bridge=xenbr0', 'type=ioemu', 'type=ioemu']