#2709 Affected Rows for ON DUPL. KEY undocumented, perheps illogical 
1. added COPY_INFO::updated to work with it in
   'insert .. on duplicate' instead of COPY_INFO::deleted
2. added affected rows to output of "info:" in mysqltest.c


client/mysqltest.c:
  added "affected rows" to output of "info : "..
mysql-test/r/insert_update.result:
  added tests for affected rows with insert .. duplicate (bug #2709)
mysql-test/t/insert_update.test:
  added tests for affected rows with insert .. duplicate (bug #2709)
sql/sql_class.h:
  added COPY_INFO::updated
sql/sql_insert.cc:
  get write_record to work with COPY_INFO::updated instead of 
  COPY_INFO::deleted for 'insert ... duplicate' statement