The output of "bridge fdb show" command invoked under a network
namespace is unpredicable. Sometime it returns empty, and sometime
non-stop rolling output. This perhaps is a bug in kernel
and/or iproute2 implementation. To work around, display fdb for
each bridge.
Signed-off-by: Su Wang <su.wang@docker.com>
Starting from 18.09, there's a per node LB for each overlay
network, this change adds the check to node LB.
This change should not break on older docker versions.
Signed-off-by: Xinfeng Liu <xinfeng.liu@gmail.com>
