Disable/blacklist failing tests for boot2qt

Currently boot2qt is tested with QEMU and some tests fail. Disabling
them for now to make it possible to enable qt5 tests for Coin.

Task-number: QTBUG-60266
Change-Id: Ib93153c857c1645c189db1bd69951cc29acfdccf
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>