Support batch tokens in renewer and caching proxy for transit auto-unseal #7441
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This is a series of small changes.
The first makes api.Renewer work properly with batch tokens. It will not attempt to renew them, and instead will simply exit when it is time to reauthenticate, using the same logic to calculate that time as service tokens.
The others make it possible to use agent's caching proxy with Transit auto unseal. This includes allowing token to be passed in, and not trying to start a renewer if no token is passed in.