Feature #10549: non-qualified products
allow cetbuildtools to produce a product without a debug or prof qualifier
cetbuildtools should allow the user to build a product with a single (e.g., e7) qualifier.
The user will still specify whether the build is debug, opt, or prof, but there is an implicit promise that this particular product will only need the single build.
Note that the exact same functionality is available now by specifying, say, e7:prof for the build and using this for all subsequent setup calls and table file entries.