make the VaultFactory contract upgradable

[turadg]

What is the Problem Being Solved?

For the next release all contracts with precious state must be upgradable.

Description of the Design

Adopt the vivification methods and iron out kinks.

One will be that outstandingQuote cannot survive upgrade because it's a promise and #3787. Upon upgrade restart the liquidator activity, which is the loop waiting for the quote promise to be resolved. Basically, liquidationInProgress and outstandingQuote need to be made ephemeral.

Security Considerations

Test Plan

There must be an automated test of upgrade, using the new flow framework.