tests: make alloc id consistent in helper
tests: make alloc id consistent in helper

It worked, but the old code used a different alloc id for the path than
the actual alloc! Use the same alloc id everywhere to prevent confusing
test output.

dvusboy/nomad,nak3/nomad,burdandrei/nomad,dvusboy/nomad,hashicorp/nomad,nak3/nomad,burdandrei/nomad,hashicorp/nomad,hashicorp/nomad,dvusboy/nomad,dvusboy/nomad,burdandrei/nomad,burdandrei/nomad,nak3/nomad,nak3/nomad,hashicorp/nomad,hashicorp/nomad,dvusboy/nomad,burdandrei/nomad,nak3/nomad,nak3/nomad,burdandrei/nomad,hashicorp/nomad,nak3/nomad,dvusboy/nomad,dvusboy/nomad,burdandrei/nomad