Prioritize blacklisting over QEXPECT_FAIL so that a test that is
blacklisted no longer fails if QEXPECT_FAIL returns true unexpectedly. To
reflect this state properly, the two values of BXPASS and BXFAIL were
added to testlib's output.
[ChangeLog][Important Behavior Changes][QtTestLib] Blacklisting of tests
will be taken into account for XPASS and XFAIL. A blacklisted test that
causes an XPASS will no longer be a fail.
Task-number: QTBUG-72928
Change-Id: Ia2232fdc714d405fa3fd9aea6c89eb2836bc5950
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>