MRP prestudy: integration in Infix bridge

[troglobit]

How does MRP work, and can it be started and configured?

Investigate:

• [ ] Finit start script?
• [ ] Patch to add mrp.conf or
• [ ] Read mrp.conf and configure kernel
• [ ] Start bridge when MRP is configured
• [ ] Timers, what can we reliably support?
• [ ] DSA driver modifications needed?

Note: YANG model and NETCONF support is defined in #516.