Return the targets from the flat yaml file, checks opts for location but
    defaults to /etc/salt/roster

def targets(tgt, tgt_type='glob', **kwargs):
    '''
    Return the targets from the flat yaml file, checks opts for location but
    defaults to /etc/salt/roster
    '''
    rmatcher = RosterMatcher(tgt, tgt_type)
    return rmatcher.targets()