Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.
Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96
sequential IP ID case (e.g. ping -f), distribution fell into 8-10 buckets
out of 64. With Jenkins hash, distribution is even.
o Add random seed to the hash.
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function names have changed and comments are reformatted or added, but
there is no functional change.
Claim copyright for me and Adrian.
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