will have _L_ mark, dictionaries created using USE_PUTS (2440 log suppression, a.k.a. put-loader) will 
have _P_ mark, dictionaries created without loader will have no mark.

git-svn-id: file:///svn/toku/tokudb@27298 c7de825b-a66e-492c-adef-691d508d4ae1