a bit more work on failsafe replication


client/mysqltest.c:
  added require_manager support
mysql-test/mysql-test-run.sh:
  added --no-manager
mysql-test/r/rpl_failsafe.result:
  updated result
mysql-test/t/rpl000018.test:
  must have manager
mysql-test/t/rpl_failsafe.test:
  must have manager
sql/repl_failsafe.cc:
  more work
sql/repl_failsafe.h:
  more work
sql/slave.cc:
  update replication status for fail-safe replication on different events