Closes [t:2612] Make separate override functions for use by toku_os_write(), toku_os_full_write(), toku_os_pwrite(), and toku_os_full_pwrite(). Modify src/tests/diskfull.c to use new override functions.

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git-svn-id: file:///svn/toku/tokudb@20217 c7de825b-a66e-492c-adef-691d508d4ae1

Merge the 2571 double-buffering stuff over and delete the 2571 branch.  Double buffering of the file merge is complete.  Fixes #2571. close[t:2571]
{{{
svn merge -r 20199:20206 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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git-svn-id: file:///svn/toku/tokudb@20208 c7de825b-a66e-492c-adef-691d508d4ae1

[t:2499] Replace multiple free_loader() calls for each error condition in toku_loader_create_loader() with single call on exit.


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{{{
svn merge -r 20187:20196 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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fix an uninitialized var problem in the ydbloader.
refs[t:2597] refs[t:2598]
merge -r 20145:20165 tokudb.2597 to tokudb



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{{{
svn merge -r 20089:20155 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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[t:2504] Bug fix, do not attempt to update accountability counters when toku_lt_acquire_range_read_lock() or toku_lt_acquire_range_write_lock() is called with NULL tree.

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[t:2499] Allow test program to set loader's scale_factor. Improve loader-cleanup-test to exercise with different combinations of size_factor, ENOSPC from toku_os_write(), and abort_on_poll. Command line options are used to exercise known bugs.

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{{{
svn merge -r 20067:20072 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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{{{
svn merge -r 20030:20036 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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the brt_loader_sort_and_write_rows contract changed which caused the tests to fail.  fix the tests closes[t:2593] #2593

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 * bradley's benchmarking changes, and
 * the big speedup in the sort-and-write-rows (slowness caused the lock in fidx2file).
Refs #2571. [t:2571]
{{{
svn merge -r 19909:20027 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
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git-svn-id: file:///svn/toku/tokudb@20029 c7de825b-a66e-492c-adef-691d508d4ae1

[t:2499] Induce ENOSPC errors in more places, some concentrated at beginning of load, some concentrated at end, some sprinkled in the middle."


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