Patches for Berkeley DB version 4.6.21

  1. [#15692] Fixes a race condition between checkpoint and DB->close which can result in the checkpoint thread self-deadlocking.
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  2. [#16178] Fixes the potential for the wrong number of mutexes to be allocated. This issue could cause applications with multiple cache regions to see undefined behavior in rare cases under load.
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  3. [#16406] Replication clients should be able to open a sequence.
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  4. [#15788] Fixes a bug which could lead to slow performance of internal init under Replication Manager, as evidenced by "queue limit exceeded" messages in verbose replication diagnostic output.
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