eliminate explicit specification of protocol in tests and
loops over protocol. We only support SSHv2 now.
Upstream-Regress-ID: 0082838a9b8a382b7ee9cbf0c1b9db727784fadd
[regress/forward-control.sh]
bump timeout to 10 seconds to allow slow machines (e.g. Alpha PC164)
to successfully run this; ok djm@
(ID sync only; our timeouts are already longer)