utils: should not require go

[mh-cbon]

in sh scripts

https://github.com/mh-cbon/go-bin-rpm/blob/master/setup-repository.sh#L33
https://github.com/mh-cbon/go-bin-rpm/blob/master/create-pkg.sh#L21

go should be avoided to improve speed.

go is currently required by utils itself,
https://github.com/mh-cbon/go-bin-rpm/blob/master/create-pkg.sh#L76

utils should be promoted to a versionned program available on gh release page.

go is currently required by latest, see mh-cbon/latest#1