Remove most warnings and deprecations from tests #667
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This commit is dependant on #663 or #666 to upgrade the PHPUnit dependency to ^8. It brings the tests to a passing state by removing all deprecation warnings that are within this project's control, and configuring PHPUnit to be aware that the remaining 6 warnings are not fixable.
See passing CI result for this commit put on top of #663 at https://travis-ci.com/github/GKFX/FOSOAuthServerBundle/builds/188814729.