* update go version to 1.18 for api and sdk, go mod tidy
* removes ioutil usage everywhere which was deprecated in go1.16 in favour of io and os packages. Also introduces a lint rule which forbids use of ioutil going forward.
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Fixes#3326
Originally I started out making this configurable, but realized it wasn't
worth the complexity. If you are restoring a snapshot, you really need to
wait until it's done, or something bad happens like losing leadership, which
will already trigger an error. Rather than have operators have to tune this
to cover whatever their snapshot size is, we just make it block here. There's
also already a bocking barrier right after the restore that hasn't been a
problem.
Ronald