It appears tests compiled with MSVC2013/64bit are prone to
crashes. Keep only a developer build/compile test in default.txt
and move the packacking builds to qt5.txt with tests disabled.
Enable testing with MSVC2017 builds in qt5.txt.

Task-number: QTBUG-58654
Task-number: QTBUG-50835
Change-Id: I6061fe3a585c4bb94100d73d04434aca42c82608
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>