start Collapsed Commissioner

        Returns:
            True: successful to start Commissioner
            False: fail to start Commissioner

def startCollapsedCommissioner(self):
        """start Collapsed Commissioner

        Returns:
            True: successful to start Commissioner
            False: fail to start Commissioner
        """
        print '%s call startCollapsedCommissioner' % self.port
        startCmd = WPANCTL_CMD + 'form %s -c %s -T router' % (self.networkName, str(self.channel))
        if self.__sendCommand(startCmd) != 'Fail':
            time.sleep(2)
            cmd = WPANCTL_CMD + 'commissioner start'
            print cmd
            if self.__sendCommand(cmd)[0] != 'Fail':
                self.isActiveCommissioner = True
                time.sleep(20) # time for petition process
                return True
        return False