Exclude classes requiring a QApplication from VTK smoke tests

Some classes require QApplication::instance to return true to operate
correctly.  Since TestEmptyInput and TestSetGet do not initialize a
QApplication, exclude such classes from these tests.  Otherwise the
tests crash with Qt5 because QFont expects a QGuiApplication.

Change-Id: I39d20da526884ebe897cf2be125f441aaf39d21e
Merge topic 'smoke-test-exceptions-for-qt5' into master

29268343 Exclude classes requiring a QApplication from VTK smoke tests