XWIKI-8944: Use the bridge to the new security authorization component as the default RightService

 - move XWikiAuthorizationTests in its right place, the API, to DefaultAuthorizationManagerIntegrationTest
 - convert the test into Mockito based mock, now isolating the API alone. Great performance improvement
 - rewrite of the parser of XML wiki definition for tests (hope to make it more generalized later)
 - isolate the DefaultAuthorizationSettler test to avoir side effect on other tests
 - improved test coverage