This commit re-enables tests that are assumed to be ok by now, since they:
- Have been passing in CI for a long time recently (more precisely, not failed once in pulse run range 730-829).
- Did not have any known issues associated with them.
Note that not all of these tests were disabled as a result of QTBUG-21402.
Task-number: QTBUG-21402
Change-Id: I80bbf8b351bd9165aa968e98f4dc17e8be6bc7c3
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>