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[t:5006] support VALGRIND_PREFIX for using non-standard valgrind installations (and error out correctly if we don't find valgrind).  fixes #5006

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Now verifies there is exactly one handle and returns it.
Removing this code entirely would make refcounting more complicated.

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[t:4967] remove the ydb lock from end checkpoint. note_unpin_by_checkpoint removes an ft reference, which is protected by the ft's ref lock.


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[t:4872] remove ydb lock usage for log_archive, opened ticket #4961 to investigate if any threading issues exist with that function

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[t:4948] move env_simple.* out of src/tests (into /tokudb.data), update upgrade_simple.c to find them

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