[Piglit] [Patch v3] generated_tests: Actually catch exception in os.makedirs

[Mark Janes]

Dylan Baker <baker.dylan.c at gmail.com> writes:

> Patch b59ff71eb was supposed to fix os.makedirs exceptions, but falls
> short because of a missing else statement that causes all of the caught
> exceptions to fall back to raise.
>
> This corrects, it also pulls the duplicate functions out into a shared
> module.
>
> v2: - remove accidentally included hunk (Mark)
> v3: - Actually include the modules directory in the commit (Mark)

Reviewed-by: Mark Janes <mark.a.janes at intel.com>