Since we now have separate namespaces due to the multi-file split, we
don't need to keep the name of the module in the property names, as we
don't have so many potential conflicts anymore.

We remove the group prefix handling from TestHelper and simply do a
sed over all the test files, removing it from the function names.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>