www/tt-rss ttrssd user review

I've been sitting on a patch for a while now to add a ttrssd user to run
ttrssd (the update daemon) from www/tt-rss.  

Originally from this pull request.
https://github.com/freebsd/freebsd-ports/pull/306

Instead of changing the user if someone wanted to not use ttrssd with
ttrssd_run_as_user any alt. user would just be added to the ttrssd
group.  However, I think adding the user to ports would be good enough
for all cases.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282245
https://reviews.freebsd.org/D49128

- Create a ttrssd user and group to run ttrssd.
- Move log file to /var/log/tt-rss directorie.
- Move pid files to /var/run/tt-rss directorie.
- Move on disk data to /var/tt-rss/.

I've been using this patch for while but looking for a full review.

Anyone able to provide feedback?