make Vault Factory configurable with new Auctioneer contract

[turadg]

What is the Problem Being Solved?

auctioneer returns non-durable facets so we’ll need to give vaultFactory the new publicFacet after upgrade. That means we have to upgrade vaultFactory too, giving it a way to receive an auctioneer other than in its terms (because terms are only for initial start of a contract).

Description of the Design

The auctioneer is an implementation detail of the vaultFactory contract. Therefore it can go in privateArgs.

Move it from terms to privateArgs, so that it's set upon each start of the contract.

Security Considerations

Scaling Considerations

Test Plan

Blocked by

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1. vaultFactory contract not upgradable #8079
   Vaults bug +2