e2e/cli: use discover utility for nomad binary
e2e/cli: use discover utility for nomad binary

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