docs: def match_member_id(self, member_conf, current_member_confs):
          """
          Attempts to find an id for member_conf where fom current members confs
          there exists a element.
          Returns the id of an element of current confs
          WHERE member_conf.host and element.host are EQUAL or map to same host
          """
          if current_member_confs is None:
              return None
  
          for curr_mem_conf in current_member_confs:
              if is_same_address(member_conf['host'], curr_mem_conf['host']):
                  return curr_mem_conf['_id']
  
          return None