syslog-ng: restore service "reload" to actually working

Commit 44a16ca broke syslog-ng such that it no longer works with
logrotate, for example.  Yes, you can manually stop and start the
service, but (1) you shouldn't have to and (2) it creates a window
where you potentially lose messages if the syslog UDP socket
overruns.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
(cherry picked from commit c27f4ca53b)

admin/syslog-ng/files/syslog-ng.init

@@ -11,3 +11,7 @@ start_service() {
 	procd_set_param command /usr/sbin/syslog-ng --foreground
 	procd_close_instance
 }
+
+reload_service() {
+	/usr/sbin/syslog-ng-ctl reload
+}