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Commit 9a6e96f ("Before sending ARPs/NAs, check the bridge is ready")
introduced a check that, if a container's veth is connected to a bridge,
the port is forwarding before sending unsolicited ARP/NA messages to
advertise the container's MAC/IP addresses.
It waited for up-to 200ms, but it seems that's not always enough.
If the port isn't forwarding, the ARP/NA messages will be silently
dropped. But, if it comes up within two seconds, one or both of the
resends will succeed.
So - keep the wait for 200ms but, if anything goes wrong with checking
the bridge port's state, or it's not forwarding after that time, just
log an info/warning level message and continue.
Signed-off-by: Rob Murray <rob.murray@docker.com>