HTMLDOMSanitizerTest : fix "Fatal error: Cannot declare class InlineImage, because the name is already in use in /var/www/html/iTop/test/core/sanitizer/InlineImageMock.php"
We are now injecting the class to mock, instead of declaring another class with the same name (was working before but why ?!???)
\UtilsTest::testSanitizer : no more testing the "class" filter, because it is a simple indirection, and we need to load datamodel which is causing multiple problems (see the comment in the test method dataprovider)
