Vendor hcsshim dependencies

[crosbymichael]

This vendors the hcsshim dependencies so that consistent builds can be produced.

[msftclas]

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[crosbymichael]

@jterry75 @jhowardmsft let me know if you want this and i'll sign the cla or push with my docker address as we probably already have a company one.

[jterry75]

I personally am ok with vendoring here but I will leave this up to @jhowardmsft he knows this repo best

[lowenna]

I think this makes sense, but I'll talk it over with @jstarks when he's back from PTO next week.

[jterry75]

@crosbymichael - You can remove the 2nd commit. We fixed the go-winio build issue