Return values of expected type by the block layer

Signed-off-by: Michal Rakowski <michal.rakowski@intel.com>

configure

@@ -61,7 +61,7 @@ generate_header() {
 	echo "Configuring OpenCAS"
 	for file in $FIRST; do
 		CONF=$(cat ${CONFIG_FILE} | grep $(basename $file) | cut -d' ' -f2)
-		source $file "apply" "$CONF" "$file" &
+		source $file "apply" "$CONF" "$file"
 	done
 
 	wait