utils: fix kamctl start if installed in a custom prefix, tested from Fabian Borot

utils/kamctl/kamctl

@@ -1610,9 +1610,9 @@ openser_start() {
 		exit 1
 	fi
 	if [ $SYSLOG = 1 ] ; then
-		$OSERBIN -P $PID_FILE $STARTOPTIONS 1>/dev/null 2>/dev/null
+		$OSERBIN -P $PID_FILE  -f $ETCDIR/kamailio.cfg $STARTOPTIONS 1>/dev/null 2>/dev/null
 	else
-	 	$OSERBIN -P $PID_FILE -E $STARTOPTIONS
+		$OSERBIN -P $PID_FILE -E  -f $ETCDIR/kamailio.cfg $STARTOPTIONS
 	fi
 	sleep 3
 	if [ ! -s $PID_FILE ] ; then