Patch corrects minor test anomolies and build warnings.


mysql-test/extra/rpl_tests/rpl_extraMaster_Col.test:
  WL#3915 : (NDB) master's cols > slave
  
  Patch masks out the port number in the show slave status results.
mysql-test/r/rpl_extraColmaster_innodb.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file from changed test.
mysql-test/r/rpl_extraColmaster_myisam.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file from changed test.
mysql-test/r/rpl_row_extraColmaster_ndb.result:
  WL#3915 : (NDB) master's cols > slave
  
  New result file from changed test.
sql/field.cc:
  WL#3915 : (NDB) master's cols > slave
  
  Removed warning for unused parameter. Parameter was include for assertion
  and future changes to string class.