add a clean product template

sample/product-template/OPSI/postinst

@@ -0,0 +1,9 @@
+#! /bin/sh
+#
+# postinst script for softprod
+# This script executes after unpacking files from that archive and registering the product at the server.
+#
+# The following environment variables can be used to obtain information about the current installation:
+#   PRODUCT_ID: id of the current product
+#   CLIENT_DATA_DIR: directory which contains the installed client data
+#