"expiry-time" as the former is confusing wrt similar terminology in X.509;
pointed out by jsing@
OpenBSD-Regress-ID: ac8b41dbfd90cffd525d58350c327195b0937793
points to something in /dev (rather than checking the device node itself);
makes life easier for portable, where systems with dynamic ptys can delete
nodes before we get around to testing their existence.
OpenBSD-Regress-ID: b1e455b821e62572bccd98102f8dd9d09bb94994
eliminate explicit specification of protocol in tests and
loops over protocol. We only support SSHv2 now.
Upstream-Regress-ID: 0082838a9b8a382b7ee9cbf0c1b9db727784fadd