This prints a list of all the tests and how to run them:

piglit test name ::: /path/to/piglit/bin/program <args>
glean test name ::: PIGLIT_TEST='...' /path/to/piglit/bin/glean -v -v -v ...

This may be of use to our QA team, who currently use their own
infrastructure for running test suites.  Having their runner launch
piglit-run.py, which parses all.tests, for every test case, is
incredibly expensive.

This is not meant to be a long term solution.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Jose Fonseca <jfonseca@vmware.com>