closes[t:2309] [t:2308] Deprecate dup2, _dup2 (wrap with toku_dup2), and replace /dev/null with DEV_NULL_FILE
Fixes some recovery tests in windows

git-svn-id: file:///svn/toku/tokudb@17020 c7de825b-a66e-492c-adef-691d508d4ae1