test: use jimfs-based file system implementation
Motivation: To build more complicated test cases without mocking all world a timple file system suitable test is required. Modification: Adjust local file system based vfs implementation https://github.com/kofemann/simple-nfs/blob/master/src/main/java/org/dcache/simplenfs/LocalFileSystem.java to work with jimfs (Google's file system for testing). Update existing PseudoFsTest to to use DummyVFS. Result: More complicated tests can be created. Acked-by: Paul Millar Target: master
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