logrotate [TASK]: update postrotate command

systemd requires
/usr/bin/systemctl reload syslog.service > /dev/null

csback_logrotate.conf

@@ -15,6 +15,6 @@
   create 644 root root
   sharedscipts
   postrotate
-  /etc/init.d/syslog reload > /dev/null 2>&1 || true
+      /usr/bin/systemctl reload syslog.service > /dev/null
   endscript
 }