[ietf-dkim] issue 1287 (signature removal)

[Eric Allman]

After discussion with John L, it seems the best way to handle the 
multiple signature issue in section 4 is to leave it as is:

       Signers SHOULD NOT remove any DKIM-Signature header fields
       from messages they are signing, even if they know that the
       signatures cannot be verified.
eric
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