db config backend for files_external

apps/files_external/appinfo/database.xml

apps/files_external/appinfo/info.xml

apps/files_external/appinfo/update.php

apps/files_external/lib/config/configadapter.php

apps/files_external/migration/storagemigrator.php

apps/files_external/service/dbconfigservice.php

apps/files_external/service/globallegacystoragesservice.php

apps/files_external/service/globalstoragesservice.php

apps/files_external/service/legacystoragesservice.php

apps/files_external/service/storagesservice.php

apps/files_external/service/userglobalstoragesservice.php

apps/files_external/service/userlegacystoragesservice.php

apps/files_external/service/userstoragesservice.php

apps/files_external/tests/service/dbconfigservicetest.php

...iles_external/tests/service/globalstoragesservicetest.php

apps/files_external/tests/service/storagesservicetest.php

..._external/tests/service/userglobalstoragesservicetest.php

.../files_external/tests/service/userstoragesservicetest.php