Start migrating kernel-forwarder to new style xconnect NS

[edwarnicke]

Start writing the kernel-forwarder network service SDK in a style similar to the
sdk-vppagent.

You can crib in terms of how things are done from:

https://github.com/networkservicemesh/networkservicemesh/tree/master/forwarder/kernel-forwarder

[rktidwell]

@edwarnicke I'd be happy to try taking a crack at this.

[rdimitrov]

@rktidwell I'd be happy to review and assist you with that if needed 👍

[haiodo]

@rdimitrov @rktidwell Hi, We moved issue from In Progress into To Do stuff, please update status if anything is changed. Thanks.