cmd/coordinator: remove special cases for misc-vet-vetall
cmd/coordinator: remove special cases for misc-vet-vetall

See plan at https://github.com/golang/go/issues/30971#issuecomment-476383123

Updates golang/go#31040

Change-Id: I160d671670094c3ab4f9d7ba825235a865ad3376
Reviewed-on: https://go-review.googlesource.com/c/build/+/169198
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

golang/build,golang/build,golang/build,golang/build