milter manager

A bug fix release of 1.6.8.

=== All

==== Improvements

* autogen.sh supports bash.
[Reported by Kenji Shiono]

=== Document

==== Improvements

* Followed Ruby milter's change.
[Reported by akira yamada]

=== milter manager

==== Improvements

* Added
((<database.extra_options|configuration.rd#database.extra_options>))
configuration item.
* Supported exception handling in callback.

==== Fixes

* Fixed a bug that define_connection_checker raises an
exception.
[Reported by Kenji Shiono]

=== milter-client

==== Improvements

* Supported error report when UNIX domain socket mode
change is failed.

=== milter-performance-check

==== Improvements

* Added --starttls option.
* Added --auth-user option.
* Added --auth-password option.
* Added --auth-mechanism option.
* Added --auth-map option.

==== Fixes

* Fixed a bug that --smtp-port is ignored.

=== Thanks

* Kenji Shiono
* akira yamada