Merge pull request #14077 from owncloud/autotest-external-swift

apps/files_external/tests/backends/swift.php

apps/files_external/tests/env/start-amazons3-ceph.sh

apps/files_external/tests/env/start-ftp-morrisjobke.sh

apps/files_external/tests/env/start-sftp-atmoz.sh

apps/files_external/tests/env/start-smb-silvershell.sh

apps/files_external/tests/env/start-smb-windows.sh

apps/files_external/tests/env/start-swift-ceph.sh

apps/files_external/tests/env/start-webdav-ownCloud.sh

apps/files_external/tests/env/stop-swift-ceph.sh

autotest-external.sh