tests: use drmtest_skip() in caching ioctl helpers

This way we can rip out all the skip handling from the test control flow,
and additionally (by using drmtest_retval()) even get correct exit codes.

The only tricky part is that when we only want ot skip parts of a test
(like for gem_pread and gem_pwrite) we need to split out those parts as
subtests. But no addition of control-flow is required, the set/longjmp
magic in the helpers all makes it happen.

Also we make extensive use of the behaviour of drmtest_skip to skip
all subsequent subtests if it is called outside of a subtest. This allows
us to re-flatten the control flow a lot.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/gem_caching.c

@@ -118,10 +118,7 @@ int main(int argc, char **argv)
 
 	fd = drm_open_any();
 
-	if (!gem_has_caching(fd)) {
-		printf("no set_caching support detected\n");
-		return 77;
-	}
+	gem_check_caching(fd);
 
 	devid = intel_get_drm_devid(fd);
 	if (IS_GEN2(devid)) /* chipset only handles cached -> uncached */