Added generate-packages.sh: script to build packages

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

generate-packages.sh

+#!/bin/bash
+set -eux
+for d in *vnf; do
+    osm package-build $d
+done
+for d in *ns; do
+    osm package-build $d
+done
+