[issue28847] dumbdbm should not commit if in read mode

[Martin Panter]

Martin Panter added the comment:

Serhiy: The Windows buildbots are having trouble removing read-only files. Maybe restore the write mode for the end of the test, or fix support.rmtree()? See <https://docs.python.org/3/library/shutil.html#rmtree-example>.

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nosy: +martin.panter

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