Support non-standard protocol version identification

[yew]

Non-standard protocol version identification will cause connect to fail with error message "Socket read operation has timed out after 30000 milliseconds."
I have checked the code, this is caused by such identification not matching the server version regex.

SSH.NET/src/Renci.SshNet/Connection/ProtocolVersionExchange.cs

Lines 71 to 77 in 6e1f839

	var identificationMatch = ServerVersionRe.Match(line);
	if (identificationMatch.Success)
	{
	return new SshIdentification(GetGroupValue(identificationMatch, "protoversion"),
	GetGroupValue(identificationMatch, "softwareversion"),
	GetGroupValue(identificationMatch, "comments"));
	}

Is softwareversion a required property in subsequent data transfer? If not, we can support that kind of servers.
And WinSCP and FileZilla support this identification.

[Rob-Hague]

Fixed by #1441