Replacing revoked keys made me wonder if we actually need an auto-refresh key.
If we try to return one valid key with --locate-keys wouldn't it make more sense
semantically if we use the auto-key-locate mechanisms with locate-keys when a
key is expired in the local store?

This would also work better for revoked keys where a Parcimonie style auto
refresh would pick up the revocation and locate-keys would then look for a new key.