Merge pull request #10985 from owncloud/db-cleanup

core/command/maintenance/repair.php

lib/private/appframework/db/db.php

lib/private/db.php

lib/private/db/connection.php

lib/private/db/connectionfactory.php

lib/private/db/connectionwrapper.php

lib/private/db/mdb2schemamanager.php

lib/private/preferences.php

lib/private/server.php

lib/private/updater.php

lib/public/idbconnection.php

tests/lib/tags.php