Avoid releasing sent buffer to early in BookieClient mock #1651
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Cherry pick tp branch-4.8 commit 6b9cbf2 from Ivan Kelly
If the buffer was sent to more than one bookie with the mock, it would
be released after being sent to the first one. Each write should
retain a refCount themselves, and then release when done.
Author: Ivan Kelly ivank@apache.org
Relates to #1598, closes #1643