'Set up an SSH connection, use a channel from that connection to launch
a command, and hook the stdin and stdout of that command up as a
transport for a protocol created by the given factory.
@param protocolFactory: A L{Factory} to use to create the protocol
which will be connected to the stdin and stdout of the command on
the SSH server.
@return: A L{Deferred} which will fire with an error if the connection
cannot be set up for any reason or with the protocol instance
created by C{protocolFactory} once it has been connected to the
command.'

def connect(self, protocolFactory):

    d = self._creator.secureConnection()
    d.addCallback(self._executeCommand, protocolFactory)
    return d
