[Cake] Upstream submission of dual-mode fairness patch

[Pete Heist]

I added some text for the ingress keyword and related fairness behavior to the cake man page, in case there’s feedback or changes:

https://github.com/dtaht/tc-adv/pull/25/commits/9a7905a8a768fc57926b1875e8be445865e08627 <https://github.com/dtaht/tc-adv/pull/25/commits/9a7905a8a768fc57926b1875e8be445865e08627>

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