Transport reseting socket timeout to 0.1 all the time.

[mattmaniflaf]

When created a new Client connection and the socket to use is not specified, but timeout value is specified. Paramiko correctly creates the socket and sets the socket timeout value, however when instantiating the Client's transport the sockets timeout gets reset to 0.1 all the time.

Transport.init.py really should attempt to use the existing timeout value for the socket.

Current code:

        # Python < 2.3 doesn't have the settimeout method - RogerB
        try:
            # we set the timeout so we can check self.active periodically to
            # see if we should bail.  socket.timeout exception is never
            # propagated.
            self.sock.settimeout(0.1)
        except AttributeError:
            pass

Probably should read:

        # Python < 2.3 doesn't have the settimeout method - RogerB
        try:
            if sock.gettimeout() < 0:
                # we set the timeout so we can check self.active periodically to
                # see if we should bail.  socket.timeout exception is never
                # propagated.
                self.sock.settimeout(0.1)
        except AttributeError:
            pass