The life cycle of capable-switch/resources/port

[cmoberg]

Need to discuss the life cycle of the list of ports available in capable-switch. E.g. if there are physical ports on the device, are they pre-populated, and what does it mean to remove an enty in this list? Use cases will be helpful.

The port list is here: https://github.com/OpenNetworkingFoundation/configuration/blob/master/drafts/of-config.yang#L393