T38: Add callbacks for tcp channel open requests

Description

Originally reported by migration: https://bugs.libssh.org/T38

Creating a libssh server using callbacks, any ssh requests with type SSH//REQUEST//CHANNEL//OPEN and subtype SSH//CHANNEL//DIRECT//TCPIP or SSH//CHANNEL//FORWARDED//TCPIP get rejected. To support port forwarding, it would be helpful to server callbacks to handle these messages.

Comments:

migration commented on 2017-06-19 06:52:54 UTC:

On Tuesday, October 20th 2015 18:13:22, Andreas Schneider

changed task status from "New" to "Assigned"
assigned the task to Aris Adamantiadis

migration commented on 2017-06-19 06:52:54 UTC:

On Tuesday, October 20th 2015 18:31:29, Weiyin He wrote:

Btw, this patch has worked well for me: http://www.libssh.org/archive/libssh/2014-03/0000023.html

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