AutoTest: Redo reporting of disabled tests

Provide a proper way of reporting disabled tests instead
of the hacky one.

Change-Id: Id3a775d57ac20c9db8ad0f504cb708021117aa2f
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testrunner.cpp

@@ -273,6 +273,9 @@ void TestRunner::onProcessFinished()
             }
         }
     }
+    const int disabled = m_currentOutputReader->disabledTests();
+    if (disabled > 0)
+        emit hadDisabledTests(disabled);
     resetInternalPointers();
 
     if (!m_fakeFutureInterface) {