tests: deflake TestServer_ReconcileMember
tests: deflake TestServer_ReconcileMember

TestServer_ReconcileMember assumes that S3 isn't the leader:
`reconcileMembers` call would fail when attempting to remove itself!

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