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

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