Determine bridge and container network interface requirements

[awh]

In certain types of deployment (e.g. CNI) weave will not be in charge of creating bridge devices and container network interfaces. An analysis of weave must be performed to identify specific problems and document them as issues for resolution.

• Don't rely on setting ethtool tx off on guest interfaces #1255 - Don't rely on disabling TSO

[bboreham]

I think when this was filed the thinking was that we could piggy-back on the CNI 'bridge' plugin. Since then we have implemented our own Weave Net CNI plugin which does create and set up veths.

We tell people to use this after calling weave launch, which will create the bridge, so that part of the premise also bears re-considering.

[bboreham]

Closing: it's been a long time since anyone asked about working with an existing bridge.