The l3-agent recipe does not move the ip from external interface to external bridge,
which will let the network node lost external network connection.
E.g.
If the external interface is eth1 which has 10.6.12.10,
after run the l3-agent recipe, an external bridge "br-ex"
is created which plugged the eth1. But the eth1 still has
the ip, meanwhil, br-ex don't have any ip. This cause the
node lost the external network connection.
The l3-agent recipe does not move the ip from external interface to external bridge,
which will let the network node lost external network connection.
E.g.
If the external interface is eth1 which has 10.6.12.10,
after run the l3-agent recipe, an external bridge "br-ex"
is created which plugged the eth1. But the eth1 still has
the ip, meanwhil, br-ex don't have any ip. This cause the
node lost the external network connection.