intel-gpu-tools: add igt_core init func calls to some tests

igt-core.h/c provides some macros and initialisation
functions to support the tests but some of the single
tests do not use these. Modifying these tests to use
the igt_simple_main macro and igt_simple_init function
is the first step towards a consistent command line
across all tests.

Signed-off-by: Tim Gore <tim.gore@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>

tests/gem_stress.c

@@ -865,6 +865,8 @@ int main(int argc, char **argv)
 	int i, j;
 	unsigned *current_permutation, *tmp_permutation;
 
+	igt_simple_init();
+
 	drm_fd = drm_open_any();
 	devid = intel_get_drm_devid(drm_fd);