really have a right to.  It was creating the directory and then
calling {{{DB_ENV->open}}} without specifying {{{DB_CREATE}}} and then
complaining if the open was successful.

For BDB, the open is not successful because BDB has internal files it sets up.

TokuDB has no internal files (yet) because it only handles
{{{DB_PRIVATE}}} databases.  Hence creating the directory is enough to
make TokuDB happy.  And we're OK with that.

Addresses #209.


git-svn-id: file:///svn/tokudb@1263 c7de825b-a66e-492c-adef-691d508d4ae1