Add info message with current spec filename to test generators

If test specification in python contained a mistake, exec would fail and
it wouldn't show a filename of the file that was being processed. This
was confusing when generating several tests because the last filename
listed before an error was actually the file that was successfully
generated.

Test: Regenerated the tests
Change-Id: Ia1bdf6802e8855b0fa9666a6e3a37d36205acbda
2 files changed