Cleaned up memory allocation so that in all cases of malloc failure the application ends execution. 
Default values for auto-generate have been made available for adjusting. Key test for rights now works with either type of keys. 


client/client_priv.h:
  Adding options for execution defines
client/mysqlslap.c:
  Cleaning up memory allocation so that malloc failures die. 
  
  Fixed execution so that defaults are not adjustable.
mysql-test/t/mysqlslap.test:
  Adding a test for defaults.