This is how Prometheus recommends you do it, and how they do it
themselves in their client. This makes it easy to see which versions you
have deployed in your fleet, and query over it too.
* enforce the use of goimports
Instead of enforcing `gofmt`, enforce `goimports`, which also asserts
a separate section for non-builtin packages.
* run `goimports` everywhere
* exclude generated .pb.go files
* Better config test
Previously, when using the config test option `-test`, we quit fairly
earlier in the process and would not catch a variety of additional
parsing errors (such as lighthouse IP addresses, local_range, the new
check to make sure static hosts are in the certificate's subnet, etc).
* run config test as part of smoke test
* don't need privileges for configtest
Co-authored-by: Nathan Brown <nate@slack-corp.com>
brad-defined