[TASK] typo3/testing-framework 1.1 brings phpunit 6.2

Switching from 1.0 to 1.1 dependency for typo3/testing-framework
brings phpunit v6.2 which comes with namespaced classes.

This change is considered non-braeking since it is only a
core require-dev dependency.

Minor changes throught the tests:
* Fixing incomplete tests for exceptions
* A couple of namespaced phpunit class usages

Change-Id: Ia35dbfea37e3cba9fba1aad7dc84afad00ceda88
Resolves: #81696
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53324


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>