if doesn't exists or is not writable, then /var/log/mysqld_multi.log, if does not exists
or is not writable, then /tmp/mysqld_multi.log, but only in case the file does not yet
exists in /tmp. Otherwise log will be disabled, unless user explicitely sets it with an
option.


BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted