docs: def validate_against_current_config(self, current_rs_conf):
          """
          Validates the member document against current rs conf
              1- If there is a member in current config with _id equals to my id
                  then ensure hosts addresses resolve to the same host
  
              2- If there is a member in current config with host resolving to my
                 host then ensure that if my id is et then it
                 must equal member._id
  
          """
  
          # if rs is not configured yet then there is nothing to validate
          if not current_rs_conf:
              return
  
          my_host = self.get_host()
          current_member_confs = current_rs_conf['members']
          err = None
          for curr_mem_conf in current_member_confs:
              if (self.id and
                          self.id == curr_mem_conf['_id'] and
                      not is_same_address(my_host, curr_mem_conf['host'])):
                  err = ("Member config is not consistent with current rs "
                         "config. \n%s\n. Both have the sam _id but addresses"
                         " '%s' and '%s' do not resolve to the same host." %
                         (document_pretty_string(curr_mem_conf),
                          my_host, curr_mem_conf['host'] ))
  
              elif (is_same_address(my_host, curr_mem_conf['host']) and
                        self.id and
                            self.id != curr_mem_conf['_id']):
                  err = ("Member config is not consistent with current rs "
                         "config. \n%s\n. Both addresses"
                         " '%s' and '%s' resolve to the same host but _ids '%s'"
                         " and '%s' are not equal." %
                         (document_pretty_string(curr_mem_conf),
                          my_host, curr_mem_conf['host'],
                          self.id, curr_mem_conf['_id']))
  
          if err:
              raise MongoctlException("Invalid member configuration:\n%s \n%s" %
                                      (self, err))