docs: def user_list(**connection_args):
      '''
      Return a list of users on a MySQL server
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' mysql.user_list
      '''
      dbc = _connect(**connection_args)
      if dbc is None:
          return []
      cur = dbc.cursor(MySQLdb.cursors.DictCursor)
      try:
          qry = 'SELECT User,Host FROM mysql.user'
          _execute(cur, qry)
      except MySQLdb.OperationalError as exc:
          err = 'MySQL Error {0}: {1}'.format(*exc.args)
          __context__['mysql.error'] = err
          log.error(err)
          return []
      results = cur.fetchall()
      log.debug(results)
      return results