Replace `replace` with `sed` statement

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-webdav-ownCloud.sh

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

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

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

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

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

autotest-external.sh