Replication using replicate-rewrite-db did not work for LOAD DATA INFILE.
Now is does.  There was one place in the code that used current database 
instead of the rewrite database.


mysql-test/r/rpl_rewrite_db.result:
  New tests
mysql-test/t/rpl_rewrite_db-slave.opt:
  New tests
mysql-test/t/rpl_rewrite_db.test:
  New tests
sql/log_event.cc:
  Added db to set_fields function so that current db is used.
sql/log_event.h:
  Added db to set_fields function so that current db is used.