SSHClient: add 'sock' parameter to connect() for tunneling

Re #77

This parameter, if set, can be used to make Paramiko wrap an existing socket
connected to a remote SSH server. For instance, you could set up another
SSHClient directly connected to a "gateway" host, and then create a direct-tcpip
tunnel to a "target" host directly accessible from the gateway's perspective
(e.g. think of trying to establish an SSH connection to hosts behind a NAT).
The gateway host would then establish a TCP connection to the target host
directly, and a channel is exposed on the client side. This channel could be
wrapped by an SSHClient class using the connect() function, avoiding the need
to establish a new TCP connnection.

This effectively allows you to create tunneled SSH connections.

Based on work by Oskari Saarenmaa <os@ohmu.fi>, in Paramiko pull request #39.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

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