Refactor topo.py:class Edge(object) about mininet HOT 3 CLOSED

Someone browsing the code would have a good idea if this were documented properly. That's the easiest sane way to do this.

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I think the "right" way to do it may be to simply augment the existing Topo classes to allow specification of:

• default Host, Switch and Link classes or constructors (note: we need to create a Link class)
• default parameters for same
• optionally per-node/per-link classes and parameters

This could be "simplified" further by currying parameters into the constructors, although I don't know if that's actually better.

A key point is that the Host/Switch/Link parameters don't belong in Topo - they belong in the Host/Switch/Link classes, where they can and should be documented.

I have been thinking about this for a while and can create a sample implementation.

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Implemented in cs244 branch.

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