Convert user_password_reset_timeout variable to use config system

Do we want to extend the existing generic user.settings update function to include this instead of adding another one?

8.x -> 8.x updates aren't supported and this is just an internal setting without UI that nobody has set to something else (in 8.x at least ;)) anyway.

Would avoid adding another one that could possibly conflict with other issues.

I don't know, update settings conflicts are par for the course, and I can't remember a time when we've added stuff into existing update functions like that before? I'd rather just get this in and move on. I looked it over and otherwise it looks good, so lets go!

@heyrocker #1807266: Convert user_cancel_method variable to CMI system does exactly that, that's why I suggested it.

Anyway, getting this in like this is fine with me as well.

Actually, I agree it'd be nice to group like-updates together in the same update function. Can we get a quick re-roll for that? Feel free to mark back to RTBC after; as long as testbot says it's good, I can commit it.

Thanks, back to RTBC then, as webchick requested.

Looks like this needs a quick re-roll.

And back to RTBC again.

Committed to 8.x. Thanks.