Takes a tab list structure and renders it to a list for applying it to
    a file

def _render_tab(lst):
    '''
    Takes a tab list structure and renders it to a list for applying it to
    a file
    '''
    ret = []
    for pre in lst['pre']:
        ret.append('{0}\n'.format(pre))
    for cron in lst['crons']:
        ret.append('{0} {1} {2} {3}\n'.format(cron['path'],
                                                      cron['mask'],
                                                      cron['cmd'],
                                                      TAG
                                                      )
                   )
    return ret