<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def del_controller(self):
 """ Deletes the configured OpenFlow controller address. This method is corresponding to the following ovs-vsctl command:: $ ovs-vsctl del-controller <bridge> """

        command = ovs_vsctl.VSCtlCommand('del-controller', [self.br_name])
        self.run_command([command])