Re-enable the integrationtests autotests on Mac OS X

Re-enable the integrationtests autotests on Mac OS X

The tst_MacNativeEvents, tst_QAccessibility, and tst_QFocusEvent
tests currently fail, which will block any changes that attempt to
re-enable the autotests.  Ignore the failures for now by marking the
tests as insignificant.

The tst_Lancelot for currently crashes, which can destabilize the CI
system when attempting to re-enable the autotests.  Skip this test for
now by disabling the check target for it.

Change-Id: Icc1dc77ebb9b7be746606aae04c9abf2480d0c3f
Reviewed-by: Marius Storm-Olsen <marius.storm-olsen@nokia.com>