log-slave-updates since this causes unexpected values in 
Exec_master_log_pos in A->B->C replication setup, synchronization
 problems in master_pos_wait()... 
Still this brokes some functionality in sql/repl_failsafe.cc 
(but this file is not used now)


mysql-test/r/rpl_log.result:
  SHOW BINLOG EVENTS for binlog on slave should give the same 
  Orig_log_pos and Pos values
sql/log_event.cc:
  Do not propagate our master's log pos to our bin log
sql/repl_failsafe.cc:
  Added comment about broken SHOW NEW MASTER
sql/slave.cc:
  Do not propagate our master's log pos to our bin log
sql/sql_class.cc:
  THD::log_pos is no longer needed
sql/sql_class.h:
  THD::log_pos is no longer needed
sql/sql_parse.cc:
  Added comment about broken SHOW NEW MASTER