To make it easier for users to add product and updates images look for
any packages that provide lorax-product-* or lorax-updates-*
Related: rhbz#1155228
With these templates if a package has installed files in
/usr/share/lorax/product or /usr/share/lorax/updates/ they will be used
to create product.img and/or updates.img which will be included in the
images/ directory of the iso and of the final output tree.
These can be used to customize the installation environment or provide
updates. See README.product for current documentation.