This upgrades otel to v1.15.0, and the /contrib/ packages to v0.41.0.
Several dependencies are upgraded as dependencies, notably grpc.
This contains a change to grpc, only mapping some grpc.Errors into span
errors if it's Unknown, DeadlineExceeded, Unimplemented, Internal,
Unavailable, or DataLoss, which should be helpful for us as we use grpc
errors semantically in Boulder, especially NotFound.
Fixes https://github.com/letsencrypt/boulder/issues/3205.
Previously, we would only move aside Godeps.json before running `godep save ./...`. However, in order to get a true picture of what is needed, we must also remove the existing `vendor/` directory.
This change also removes some unnecessary dependencies that have piled up over the years, generally test dependencies. Godep used to vendor such dependencies but no longer does.
Updates the various gRPC/protobuf libs (google.golang.org/grpc/... and github.com/golang/protobuf/proto) and the boulder-tools image so that we can update to the newest github.com/grpc-ecosystem/go-grpc-prometheus. Also regenerates all of the protobuf definition files.
Tests run on updated packages all pass.
Unblocks #2633fixes#2636.
Matthew McPherrin