net/keepalived: update keepalived.conf generation header

Add date info to keepalived config generated.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/keepalived/files/keepalived.init

@@ -371,7 +371,8 @@ process_config() {
 	rm -f $KEEPALIVED_CONF
 
 	# First line
-	printf "! Configuration File for keepalived (autogenerated via init script)\n\n" > $KEEPALIVED_CONF
+	printf "! Configuration file for keepalived (autogenerated via init script)\n" > $KEEPALIVED_CONF
+	printf "! Written %s\n\n" "$(date +'%c')" >> $KEEPALIVED_CONF
 
 	[ -f /etc/config/keepalived ] || return 0
 	config_load 'keepalived'