57: Add M_INVALID message?

MR: What does one do with an invalid msgtype?  Options are:
     1) ignore (drop msg)
     2) die: drop TCP connection
     3) reply with ???-M_INVALID or something.

BC: I'm inclined to add M_INVALID as a MAY, or possibly a SHOULD,
but with a rule that you MUST NOT reply to M_INVALID with M_INVALID.
And the reason is indeed that we could use this to discover that
a peer doesn't understand a new (or obsolete) message or option.


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