[mgmt] Faster golang builds

[James]

I can't believe I didn't officially figure this out earlier, but if
your mgmt builds aren't finishing in less than 5 or 10 seconds, you
should probably have a read:

https://ttboj.wordpress.com/2017/02/26/faster-golang-builds/

In particular the "third" section is what will help you the most.

Happy hacking,
James
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