With go 1.17 a change to the build flags was implemented:
https://go.googlesource.com/proposal/+/master/design/draft-gobuild.md
The formatter now automatically adds the forward-compatible build tag
format and the linter checks for them, so we need to include them in our
code.
Currently trying to run etcd tests on darwin will cause the timeouts to
improperly select timeouts_darwin.go which are stricter than
timeouts_etcd.go. We fix this by always defaulting to timeouts_etcd.go
no matter the platform, and only falling back to timeouts_darwin.go if
the kvdb_etcd tag is not present.
