Adjust sabre changes in core

apps/dav/lib/caldav/caldavbackend.php

apps/dav/lib/carddav/addressbook.php

apps/dav/lib/carddav/useraddressbooks.php

apps/dav/lib/connector/sabre/auth.php

apps/dav/lib/connector/sabre/fakelockerplugin.php

apps/dav/lib/connector/sabre/taglist.php

apps/dav/tests/unit/caldav/caldavbackendtest.php

apps/dav/tests/unit/connector/sabre/FakeLockerPluginTest.php

apps/dav/tests/unit/connector/sabre/auth.php

apps/dav/tests/unit/connector/sabre/requesttest/auth.php

lib/private/files/storage/dav.php