Master stores old resource format in the registry

We intend for the master to store all internal resource representations in the new, post-reservation-refinement format. However, when persisting registered agents to the registrar, the master does not convert the resources; agents provide resources in the pre-reservation-refinement format, and these resources are stored as-is. This means that after recovery, any agents in the master's slaves.recovered map will have SlaveInfo.resources in the pre-reservation-refinement format.

We should update the master to convert these resources before persisting them to the registry.