close[t:5134] le_cursor api cleaned up, followed up on a TODO to get rid of the DB parameter from is_key_right (and improved its name too) by using a fake_db in the le_cursor plus the new toku_ft_get_descriptor() api to grab a descriptor reference. refactored some tests to get it all compiling. LE and hot indexer tests pass


git-svn-id: file:///svn/toku/tokudb@44895 c7de825b-a66e-492c-adef-691d508d4ae1