* Fix logging environment constants
* COPY_LOG_TO_SYSLOG was only working when Syslog was used
* FRESHRSS_ENV was not properly used to set logging level
* Simplify code
Always call `openlog()` even when it is not used
* Always specify syslog properties
https://github.com/FreshRSS/FreshRSS/pull/2745#discussion_r362207445
* $username is also needed further down
* No new line in syslog