Fix double logging

HEADS UP: See UPDATING for changes affecting your upgrade.

New installs not affected.

This patch adds a new rc_variable: librenms_daemonflags

The -T option is gone as that will force a log to syslog, doubling up on log
entries.

A new APP_LOG setting has been added to the .env file. Please update and
move your logs. See UPDATING.

PR: 246598
Submitted by: Dries Michiels <driesm.michiels@gmail.com>