Fixes #6020.  Detect huge pages.  The fractal tree layer notices when you create a logger (maybe there are other useful times to detect, but that's enough for now).  The ydb layer notices when you all {{{db_env->open()}}}.    The mysql handlerton notices the error in {{{tokudb_init_func()}}}.

git-svn-id: file:///svn/toku/tokudb@54498 c7de825b-a66e-492c-adef-691d508d4ae1