[pmbusplus] userspace i2c, pmbus interactions

[Jason Ling]

Hi all,

What started as an attempt to create a simple command line tool to perform
pmbus device upgrades over i2c has turned into the start of a user-space
i2c library (with some pmbus support).

I've already reused this library in some other obmc applications and it's
been fairly well unit-tested. It also comes with all the public interfaces
mocked (so you can unit test your own code).

The idea is that more and more classes get added that will support
different pmbus devices.
General idea is that each device that gets support can expose methods to
allow device upgrade, black box retrieval, etc..

Anyways, wanted to gauge community interest in this so I can determine how
motivated I should be to upstream it.
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