Changed test to enable easier debugging. 


mysql-test/extra/rpl_tests/rpl_extraMaster_Col.test:
  WL#3915 : (NDB) master's cols > slave
  
  Changes to test in order to aide debugging.
mysql-test/suite/rpl/r/rpl_extraColmaster_innodb.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file for test changes.
mysql-test/suite/rpl/r/rpl_extraColmaster_myisam.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file for test changes.
mysql-test/suite/rpl/r/rpl_row_extraColmaster_ndb.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file for test changes.