Redirect all output to syslog by means of daemon(8) having syslog support
in recent FreeBSD versions and by means of piping it to logger(1)
for previous FreeBSD versions: add influxd_facility and influxd_priority
variables (defaults to daemon.info). Bump PORTREVISION.

PR: 221960
Submitted by: Sascha Holzleiter
Approved by: cheffo (maintainer)