[Blueprint amavisd-dkim] Add DKIM support to amavisd-new by default

[Scott Kitterman]

Blueprint changed by Scott Kitterman:

Whiteboard changed to:

This seems simple enough, I don't plan to do the full wiki template
unless someone wants it.

dendrobates: I think this is a useful thing to do.  Please compete the
wiki and I will move forward with the spec approval.

Wiki page is done.  Back to you....

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  Add DKIM support to amavisd-new by default
  https://blueprints.launchpad.net/ubuntu/+spec/amavisd-dkim