Merge pull request #22707 from owncloud/use-our-public-api

apps/dav/lib/caldav/caldavbackend.php

apps/dav/lib/carddav/carddavbackend.php

apps/dav/tests/unit/carddav/carddavbackendtest.php

apps/files_external/service/dbconfigservice.php

lib/private/appframework/db/db.php

lib/private/backgroundjob/joblist.php

lib/private/comments/manager.php

lib/private/db/querybuilder/querybuilder.php

lib/public/appframework/db/mapper.php

lib/public/db/querybuilder/iquerybuilder.php

lib/public/idbconnection.php

tests/lib/appframework/db/mappertestutility.php

tests/lib/db/connection.php

tests/lib/db/querybuilder/expressionbuildertest.php

tests/lib/repair/cleantags.php