tests: Use igt macros more

tests: Use igt macros more

Often just folding together of the common if (cond) printf;
abort|igt_skip|igt_fail; pattern. But in a few cases I've ripped out
more since the igt macros will already print the condition and errno.

A few tests where more work (like ripping out return codes en masse)
is needed left as-is.

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