Fix bufferpool puts (ref #4976) (#6125)

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* Fix bufferpool puts (ref #4976)

There was a logic error in Put() which made us put all large blocks into
segment zero, where we subsequently did not look for them.

I also added a lowest threshold, as we otherwise allocate a 128KiB
buffer when we need 24 bytes for a header and such.

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* smaller stress

* cap/len

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