syslog: fix timestamp (#1579)

Previously the timestamp was locked to the time at which the logger
process started. This change parses messages in bash and then calls the
logger once for each message ignoring newlines (read -r) in order to
guarantee the timestamp is correct.

conf/init/service/nginx/log/run

@@ -4,4 +4,6 @@
 sv check syslog-ng > /dev/null || exit 1
 
 # Start the logger
-exec logger -i -t nginx
+while read -r msg; do
+  logger -i -t nginx "$msg"
+done