Disable SCP on remote device.

        Defaults to Cisco IOS command

def disable_scp(self, cmd=None):
        """
        Disable SCP on remote device.

        Defaults to Cisco IOS command
        """
        if cmd is None:
            cmd = ["no ip scp server enable"]
        elif not hasattr(cmd, "__iter__"):
            cmd = [cmd]
        self.ssh_ctl_chan.send_config_set(cmd)