Move to standard and up-to-date prom client_golang libs #3220
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See proposal #18
What this PR does / why we need it:
M3 depends on mid-2018 forks of the various prometheus/client_golang -related projects (which appear to have no modifications). The principle reason is to make it so M3, and projects dependent on M3, are able to stay near
"latest-stable" of this important library, for all the normal reasons that's desirable.