Find required bandwidth and latency defaults for requests

[sajith]

We have connection requests of this form:

class ConnectionRequest:
    source: int
    destination: int
    required_bandwidth: float
    required_latency: float

What are some good defaults for required_bandwidth and required_latency when they are not specified? They can't be 0 because the solver will then be unable to find a solution. The defaults would be also a function of topology, size, and link latency profile, so it probably is not good enough for required_bandwidth to be an arbitrarily small number and required_latency to be an arbitrarily large number. It looks like finding some good defaults will need some consideration.