Bandwidth rate multipliers and base limits

Right now rxtx_caps are stored with an instance flavor. This worked just fine in single network implementation, but when you have multiple networks, it makes sense to have different rate limits for them. I propose a base rate being set on each network, say:
network A has base rate of 10mbps
network B has base rate of 25mbps

Flavors will then store a multiplier instead of a bps rate. So:
flavor 1 has multiplier 1x
flavor 2 has multiplier 2x
flavor 3 has multiplier 2.5x
and so forth..

This leads to flavor rates for network A and B:
flavor 1 -> 10mbps and 25mbps
flavor 2 -> 20mbps and 50mbps
flavor 3 -> 25mbps and 62.5mbps