Log Message:
Update milter-manager to 1.8.1.

A bug fix release of 1.8.0.

Now, manager.event_loop_backend and manager.n_workers aren't
experimental!

=== milter manager

==== Improvements

  * [applicable-condition][sendmail] clear DNS cache for each 100 IP
    addresses.

==== Fixes

  * detach IO for launcher on daemon mode.
    use milter_client_is_run_as_daemon() to get whether daemonize or
    not. [Reported by OBATA Akio]
  * add a workaround for Ruby cleanup.
    If environment variable
    MILTER_MANAGER_RUBY_STOP_TIMER_THREAD_BEFORE_CLEANUP=yes,
    skip timer thread before cleanup.
  * use rb_fork() as fork implementation.
    This will fix --daemon doesn't work on *BSD.
    [Reported by OBATA Akio]
  * use INCLUDES to use configured libev include path rather than
    CPPFLAGS. [Reported by moto kawasaki]

=== milter-core

==== Fixes

  * fix missing null FD close by inverted condition.
    [Reported by OBATA Akio]

=== milter-client

==== Improvements

  * use higher priority for accepting connection.

==== Fixes

  * fix a bug that workers don't shutdown on master shutdown. It's
    GLib evnet loop backend specific problem.

=== milter-server

==== Improvements

  * add more information to error message.
  * [server] unify unknown name logging.

==== Fixes

  * fix a bug that all milters can't find on 2nd RCPT in the same
    session.

=== Ruby milter

==== Improvements

  * add Milter::Client::Configuration::MilterConfiguration#name.

==== Fixes

  * fix event_loop_created hook can't get event loop.
  * do not raise error if process raw shift_jis mail file. Ruby 1.9.
  * udpate bundled test-unit file list. [Reported by Hirohisa Yamaguchi]
  * [ruby][glib2] fix a SEGV bug on Solaris10.

=== milter-test-server

==== Fixes

  * fix quoted charset detection. [Reported by nobu]
  * fix multiline header parsing.
  * --mail-file keeps new line type of the original mail.

=== Document

==== Improvements

  * add log list to HTML.
  * fix typos. [Pull requested by Norio Suzuki]

=== Admin

==== Improvements

  * use locale "en" if Accept-Language is not "ja".
    [Reported by Larry G. Wapnitsky]