[Piglit] [PATCH 0/7] Initial GLX_ARB_create_context_profile, GLX_EXT_create_context_es2_profile, and GLX_ARB_create_context_robustness tests

[Ian Romanick]

This is an initial set of tests for GLX_ARB_create_context_profile,
GLX_EXT_create_context_es2_profile, and
GLX_ARB_create_context_robustness.  These tests just verify that the
GLX API generates the correct errors and allows certain required
things to work.

Since these tests share a lot of infrastructure with the
GLX_ARB_create_context tests, I've put them in the same folder.  I'm
open to other suggestions.  However, the tests are correctly separated
by extension in all.tests.

We should also have some tests to verify that requesting a particular
version and profile actually results in the correct thing being
created.  I'll get to that eventually, but it probably won't be until
Mesa drivers get closer to having 3.2 support.

v2 of the tests incorporate changes suggested by Chad Versace and
James Jones.