The test 
1. did not verify that CREATE FUNCTION shall fails in a case of active binlog
   and @@log_bin_trust_function_creators is zero if there is no DETERMINISTIC qualifier
   and super user privilege;
2. contained an explit warning on that CREATE FUNCTION actually succeeded whereas
   it was supposed to fail;
3. did not demand the bin-log be set ON even though it has contained the opt file
   explictily setting the name for the binlog file.
      
Fixed 1-3 with modifying the test accordingly.