Merge 2948 changes to main: Start putting upsert into brt layer (Refs #2948).  Also add unused attributes (Closes #2950). [t:2948] close[t:2950] 
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svn merge -c 24081 https://svn.tokutek.com/tokudb/toku/tokudb.2948
}}}
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[t:2947] Merge from tokudb.2947.  Added errno to error log, don't take minicron lock for engine status.  I want to print engine status to error log, but the env isn't available everywhere, so that's not here (yet).

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#2919 refs[t:2919] speed up brt_is_empty by applying a noop instead of an optimize message to the leaf nodes

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Merge the fixes for #2862, #2861, and #2269 onto main.  Fixes #2269, #2861, #2862.  close[t:2269] close[t:2861] close[t:2862]
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svn merge -r 23006:23042 https://svn.tokutek.com/tokudb/toku/tokudb.2862b
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#2875 refs[t:2875] check ascending keys, check expected primary key, check expected number of rows in the loader-stress-test

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