very minor changes: a STOP SLAVE in a replication test to get rid of a non critical message in slave.err,
and a comment update


mysql-test/r/rpl_server_id2.result:
  result update
mysql-test/t/rpl_server_id2.test:
  We stop the slave before cleaning up otherwise we'll get
  'drop table t1' executed twice, so an error in the slave.err
  (not critical).
sql/slave.cc:
  update comment about 4.1 now that 4.1 is fixed (in a few minutes, exactly)