docs: def is_jid(jid):
      '''
      Returns True if the passed in value is a job id
      '''
      if not isinstance(jid, six.string_types):
          return False
      if len(jid) != 20 and (len(jid) <= 21 or jid[20] != '_'):
          return False
      try:
          int(jid[:20])
          return True
      except ValueError:
          return False