Sets the OpenFlow controller address.

        This method is corresponding to the following ovs-vsctl command::

            $ ovs-vsctl set-controller <bridge> <target>...

def set_controller(self, controllers):
        """
        Sets the OpenFlow controller address.

        This method is corresponding to the following ovs-vsctl command::

            $ ovs-vsctl set-controller <bridge> <target>...
        """
        command = ovs_vsctl.VSCtlCommand('set-controller', [self.br_name])
        command.args.extend(controllers)
        self.run_command([command])