Merge pull request #24514 from owncloud/federation-psr4

apps/federation/lib/API/OCSAuthAPI.php

apps/federation/lib/AppInfo/Application.php

apps/federation/lib/BackgroundJob/GetSharedSecret.php

apps/federation/lib/BackgroundJob/RequestSharedSecret.php

apps/federation/lib/Command/SyncFederationAddressBooks.php

apps/federation/lib/Controller/SettingsController.php

apps/federation/lib/DAV/FedAuth.php

apps/federation/lib/DbHandler.php

apps/federation/lib/Hooks.php

apps/federation/lib/Middleware/AddServerMiddleware.php

apps/federation/lib/SyncFederationAddressBooks.php

apps/federation/lib/SyncJob.php

apps/federation/lib/TrustedServers.php

apps/federation/tests/API/OCSAuthAPITest.php

apps/federation/tests/BackgroundJob/GetSharedSecretTest.php

...ederation/tests/BackgroundJob/RequestSharedSecretTest.php

apps/federation/tests/Controller/SettingsControllerTest.php

apps/federation/tests/DAV/FedAuthTest.php

apps/federation/tests/DbHandlerTest.php

apps/federation/tests/HooksTest.php