Merge in all the changes from 18354 to 18555 from 3.1.0.  The only real change was in the engine status instrumentation.  Refs #2467. [t:2467].
{{{
svn merge -r18354:18555 https://svn.tokutek.com/tokudb/mysql.branches/3.1.0/tokudb/
}}}
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git-svn-id: file:///svn/toku/tokudb@18657 c7de825b-a66e-492c-adef-691d508d4ae1