Rename prometheus_build_info metric to build_info

[mattbostock]

The prometheus_build_info metric is a useful way to confirm the running version of Prometheus, as is alertmanager_build_info for Alertmanager.

Since both metrics have a job label that allows them to be distinguished, I propose that we rename them to build_info.

[brian-brazil]

Fixed title to match description.

I think the current way with the application name is probably the better way, as revisions are comparable between versions of a given binary but not across binaries.

[juliusv]

@brian-brazil Yeah, kind of an edge case. You could still count the total number of Go versions you have in production across binaries though. But maybe that is not important enough.

[brian-brazil]

That'd be an argument for a separate metric for the go version I think.

[brian-brazil]

Thinking a little more, we probably the Go version to be a default metric that comes with client_golang.

[juliusv]

@brian-brazil That totally makes sense.

[juliusv]

Closing in favor of prometheus/client_golang#328

[lock]

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