Log Message:
Update milter-manager development snapshot to 1.5.2

A bug fix release of 1.5.1.

We recommend development version users who use a milter that uses
NO_REPLY_* or milter-greylist 4.3.x upgrade to this version.

=== Document

==== Improvements

  * Created ((<available milters|available-milters>)) list.
  * Updated recommended milter-greylist configuration.

=== milter manager

==== Improvements

  * Supported S25R ((<whitelist customize
    |"doc/configuration.rd#s25r.add_whitelist">)) and
    ((<blacklist
    customize|"doc/configuration.rd#s25r.add_whitelist">)).

=== milter-manager-log-analyzer

==== Improvements

  * Supported milter-greylist 4.3.x.

=== milter-toolkit

==== Improvements

  * Used inet_pton()/inet_pton() instead of
    inet_aton()/inet_ntoa(). [Suggested by SATOH Fumiyasu]