Use the quality field in reliable_channel

[fhaynes]

Currently we aren't using it for anything, so I've prefaced it with a _. This is a tracker to remind us to use it.

[kstrafe]

What's the intent of the field?

[TimonPost]

It is originally meant for congestion management, and this enum would point out whether the network is good or bad. So in order for this value to function, we should implement that.