- Fix test case to work also when filesystem time differs
   from mysqld' time. I.e when running with data files on a
   network share.


mysql-test/r/rpl_rotate_logs.result:
  Update result file
mysql-test/t/rpl_rotate_logs.test:
  Calculate time to use in "purge master logs before" by taking
  last modification time of t2 and adding 1 second
  This is done in order to handle the case where file system time differs
  from mysqld's time