#3588 set the default tokudb_prelock_empty to on refs[t:3588]

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@32674 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/hatoku_hton.cc

@@ -116,7 +116,7 @@ static MYSQL_THDVAR_BOOL(prelock_empty,
   "Tokudb Prelock Empty Table",
   NULL, 
   NULL, 
-  FALSE
+  TRUE
   );
 static MYSQL_THDVAR_UINT(block_size,
   0,