restage of qt5 integrations reused previous failure results

https://codereview.qt-project.org/#/c/237334/ Update submodules on 'dev' in qt5

First run, triggered by bot

https://testresults.qt.io/coin/integration/qt/qt5/tasks/1534928109

https://testresults.qt.io/logs/qt/qtdeclarative/3bfb5c17674bf475943fb807b9a063728ea65047/MacOSOSX_10_11x86_64MacOSOSX_10_11x86_64Clangqtci-osx-10.11-x86_64-3-755e89Release_NoFramework_DisableTests/70c83926e9cf7012474ac73a0496ccfe482ff5df/build_1534928493/log.txt.gz

It was a common flaky thing recently, qmake crash on macOS.

Then I had 3 times re-stage,

https://testresults.qt.io/coin/integration/qt/qt5/tasks/1534971879

https://testresults.qt.io/logs/qt/qtdeclarative/3bfb5c17674bf475943fb807b9a063728ea65047/MacOSOSX_10_11x86_64MacOSOSX_10_11x86_64Clangqtci-osx-10.11-x86_64-3-755e89Release_NoFramework_DisableTests/70c83926e9cf7012474ac73a0496ccfe482ff5df/build_1534928493/log.txt.gz

https://testresults.qt.io/coin/integration/qt/qt5/tasks/1534985696

https://testresults.qt.io/coin/integration/qt/qt5/tasks/1534993318

The integrations links are different, but the failure build log are same with the first one, didn't get re-run at all.