[RFC] origin peer type

Right now we have siblings, parents, and multicast peers with their own
types. By origin servers require both parent and origin flags to be set.

I propose adding a peer type of "origin". Collapsing the parent type +
originserver flag(s) into one peer type and making it a clear
distinction between upstream proxies and origins.

Thoughts?

Does anyone know of a case where originserver flags is valid on sibling
or multicast peer relationsips?

Amos

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