fix high memory usage when bundling logserver image #585
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When upgrading a LogServer, the prepare includes downloading and bundling up the LogServer image for upload to the LogServer.
The bundling would store temporary files in memory until all files had been written to the bundle. This results in very high memory usage during the process.
This PR fixes the high memory usage issue by storing the files that should be bundled in temporary files on disk until they are written to the bundle. This decreases the memory usage significantly.