Support two-factor authentication

[XUKEREN]

I keep seeing these error messages using either a private key or an agent. Wasn't sure where I did wrong. Any advice would be much appreciated!!

I am connecting SSH remote host with two factor authentication and password authentication.

Remote X11 Output:
Setting up display for remote "ssh-remote".
Connecting to SSH. See Remote X11 (SSH) logs for more details.
Error: All configured authentication methods failed

Remote X11 (SSH) Output:
DEBUG: Outgoing: Writing USERAUTH_REQUEST (publickey)
DEBUG: Parser: IN_PACKET
DEBUG: Parser: Decrypting
DEBUG: Parser: pktLen:44,padLen:8,remainLen:32
DEBUG: Parser: IN_PACKETDATA
DEBUG: Parser: Decrypting
DEBUG: Parser: HMAC size:32
DEBUG: Parser: IN_PACKETDATAVERIFY
DEBUG: Parser: Verifying MAC
DEBUG: Parser: IN_PACKETDATAVERIFY (Valid HMAC)
DEBUG: Parser: IN_PACKETDATAAFTER, packet: USERAUTH_FAILURE
DEBUG: Client: Agent key #1 failed
DEBUG: Agent: No more keys left to try
DEBUG: Client: agent auth failed
DEBUG: Outgoing: Writing DISCONNECT (BY_APPLICATION)
Error: All configured authentication methods failed

[joelspadin]

I don't think I currently support two-factor authentication. I'd need to handle the authentication key prompt.

For my own reference, mscdex/ssh2#175 has some examples for handling the prompt.