* wip: fix remote cache for redis
connstr parsing and non-negative expires for #17377
TODO: finish parse, check zero case, find out why negative duration in the first place

* finish parse.
Still TODO, find out negative value, and decide if would be better to make database specific entries in the .ini file

* update ini files

* remove accidental uncomment in defaults.ini

* auth_proxy: expiration non-negative so expiration is not in the past

* fix test, revert neg in redis

* review: use errutil