The resume functionality actually shares only a little boilerplate with
the run functionality, and there is a lot of extra boilerplate that
exists (or should exist) to make resumes work correctly with all of the
command line options allowed by piglit-run. Therefore, it makes more
sense to split it out into it's own file.

Reviewed by: Kenney Phillis <Kkphillisjr@gmail.com>
Signed-off-by: Dylan Baker <baker.dylan.c@gmail.com>