Move TEST_SKIPPED_ITSELF to test_status in testHarness (#1089)

TEST_SKIPPED_ITSELF was originally located in
threadTesting.h but this no longer makes sense.
This change moves the definition to the test_status
struct in testHarness so that it can be used in the same
way that test_status' can be used.

Signed-off-by: Chetankumar Mistry <chetan.mistry@arm.com>
3 files changed