In case of failure, PHPUnit seems to skip `tearDown`, so any useful
assertion messages cannot be shown because `tearDownAfterClass` is
throwing an error because of database usage.
This commit makes sure we also restore the database in
`tearDownAfterClass` to prevent the data root restoration to fail
`addWarning` needs to be defined as well for it:
```
➜ master git:(master) ✗ bash autotest.sh sqlite
Using PHP executable /usr/local/opt/php56/bin/php
Parsing all files in lib/public for the presence of @since or @deprecated on each method...
Using database oc_autotest
Setup environment for sqlite testing on local storage ...
Installing ....
ownCloud is not installed - only a limited number of commands are available
Mac OS X is not supported and ownCloud will not work properly on this platform. Use it at your own risk!
-> For the best results, please consider using a GNU/Linux server instead.
creating sqlite db
ownCloud was successfully installed
Testing with sqlite ...
No coverage
/usr/local/bin/phpunit --configuration phpunit-autotest.xml --log-junit autotest-results-sqlite.xml
PHP Notice: Constant PHPUNIT_RUN already defined in /Users/lukasreschke/Documents/Programming/master/apps/firstrunwizard/tests/bootstrap.php on line 6
PHP Stack trace:
PHP 1. {main}() /usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar:0
PHP 2. PHPUnit_TextUI_Command::main() /usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar:514
PHP 3. PHPUnit_TextUI_Command->run() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/Command.php:106
PHP 4. PHPUnit_TextUI_Command->handleArguments() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/Command.php:117
PHP 5. PHPUnit_Util_Configuration->getTestSuiteConfiguration() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/Command.php:663
PHP 6. PHPUnit_Util_Configuration->getTestSuite() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/Util/Configuration.php:796
PHP 7. PHPUnit_Framework_TestSuite->addTestFile() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/Util/Configuration.php:926
PHP 8. PHPUnit_Util_Fileloader::checkAndLoad() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/Framework/TestSuite.php:335
PHP 9. PHPUnit_Util_Fileloader::load() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/Util/Fileloader.php:38
PHP 10. include_once() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/Util/Fileloader.php:56
PHP 11. loadDirectory() /Users/lukasreschke/Documents/Programming/master/tests/apps.php:42
PHP 12. require_once() /Users/lukasreschke/Documents/Programming/master/tests/apps.php:20
PHP 13. define() /Users/lukasreschke/Documents/Programming/master/apps/firstrunwizard/tests/bootstrap.php:6
PHP Fatal error: Class StartSessionListener contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (PHPUnit_Framework_TestListener::addWarning) in /Users/lukasreschke/Documents/Programming/master/tests/startsessionlistener.php on line 47
PHP Stack trace:
PHP 1. {main}() /usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar:0
PHP 2. PHPUnit_TextUI_Command::main() /usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar:514
PHP 3. PHPUnit_TextUI_Command->run() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/Command.php:106
PHP 4. PHPUnit_TextUI_TestRunner->doRun() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/Command.php:155
PHP 5. PHPUnit_TextUI_TestRunner->handleConfiguration() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/TestRunner.php:153
PHP 6. require_once() phar:///usr/local/Cellar/phpunit/5.1.0/libexec/phpunit-5.1.0.phar/phpunit/TextUI/TestRunner.php:805
```
we do not listen to deletion hooks anymore, because there is no guarantee that they
will be heard - requires that something fetches the CommentsManager first.
Instead, in the user deletion routine the clean up method will be called directly. Same way
as it happens for files, group memberships, config values.
