eliminate explicit specification of protocol in tests and
loops over protocol. We only support SSHv2 now.
Upstream-Regress-ID: 0082838a9b8a382b7ee9cbf0c1b9db727784fadd
Adapt tests, now that DSA if off by default; use
PubkeyAcceptedKeyTypes and PubkeyAcceptedKeyTypes to test DSA.
Upstream-Regress-ID: 0ff2a3ff5ac1ce5f92321d27aa07b98656efcc5c