'Unset pair.'

def unpair(self, mvname, rvname, flag):

    if (flag == 'normal'):
        cmd = ('iSMrc_pair    -unpair    -mv    %(mv)s    -mvflg    ld    -rv    %(rv)s    -rvflg    ld' % {'mv': mvname, 'rv': rvname})
        self._execute(cmd)
    elif (flag == 'force'):
        cmd = ('iSMrc_pair    -unpair    -mv    %(mv)s    -mvflg    ld    -rv    %(rv)s    -rvflg    ld    -force    all' % {'mv': mvname, 'rv': rvname})
        self._execute(cmd)
    else:
        LOG.debug('unpair    flag    ERROR.    flag    =    %s', flag)
    LOG.debug('Unpair    command    completed.    MV    =    %(mv)s,    RV    =    %(rv)s.', {'mv': mvname, 'rv': rvname})
