Initial version of the stack-level abstraction for Intel switches. For not,
it's mostly just a wrapper around snmpit_intel - this is because, when doing MAC-based VLANs, you never have to talk to more than one switch. When we switch to doing port-based VLANs with Intels (something we should do soon, but will take some experimenting), it will likely become a more full-fledged layer. Not at all debugged yet - won't be able to do that until we have the mini-testbed more funcitonal.
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