Use QTRY_COMPARE for dirChangedSpy, remove all unneeded
remove()/setPermission() calls (originating from the time
the test did not use QTemporaryFile), add more QVERIFY()
and messages for the other operations.
Task-number: QTBUG-30943
Change-Id: Ib3b78b1c6922539fd5e9238aa017fcdb554aacc8
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>