old_contents: 
  from brick.iscsi.iscsi import TgtAdm
  
  from vmthunder.singleton import SingleTon
  
  
  @SingleTon
  class TgtExecutor(TgtAdm):
      def __index__(self):
          TgtAdm.__init__(self, '', '/etc/tgt/conf.d')
  
  tgt = TgtExecutor()
  
  
  def create_iscsi_target(iqn, path):
      return tgt.create_iscsi_target(iqn, '', '', path)
  
  
  def remove_iscsi_target(tid, lun, vol_id, vol_name, **kwargs):
      return tgt.remove_iscsi_target(tid, lun, vol_id, vol_name, **kwargs)
new_contents: 
  from brick.iscsi.iscsi import TgtAdm
  
  from vmthunder.singleton import SingleTon
  
  
  @SingleTon
  class TgtExecutor(TgtAdm):
      def __index__(self, root_helper='', volumes_dir= '/etc/tgt/conf.d'):
          TgtAdm.__init__(self, root_helper, volumes_dir)
  
  tgt = TgtExecutor()
  
  
  def create_iscsi_target(iqn, path):
      return tgt.create_iscsi_target(iqn, '', '', path)
  
  
  def remove_iscsi_target(tid, lun, vol_id, vol_name, **kwargs):
      return tgt.remove_iscsi_target(tid, lun, vol_id, vol_name, **kwargs)
subject: fix bug