mark a master-forced rotate with a special flag


mysql-test/r/rpl000014.result:
  updated result
mysql-test/r/rpl000015.result:
  updated result
mysql-test/r/rpl000016.result:
  updated result
mysql-test/r/rpl_log.result:
  updated result
mysql-test/t/rpl000017-slave.sh:
  fix for change in master.info format
mysql-test/t/rpl_log.test:
  test for correct last_log_seq in show slave status
sql/log.cc:
  mark a master-forced rotate with a special flag
sql/log_event.cc:
  show master forced rotate info in SHOW BINLOG EVENTS
sql/log_event.h:
  master forced rotation flag
sql/slave.cc:
  keep trace of last log sequences in MASTER_INFO
  do not rotate on slave, if the rotation on master was forced by its master
sql/slave.h:
  keep track of last log sequence number in MASTER_INFO