storage: perform Raft ready processing after handling a Raft message
storage: perform Raft ready processing after handling a Raft message

This is both a cleanup and a minor performance optimization as it avoids
a trip through the Raft scheduler queue.

paperstreet/cockroach,glycerine/cockroach,glycerine/cockroach,maxlang/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,maxlang/cockroach,maxlang/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,glycerine/cockroach,glycerine/cockroach,paperstreet/cockroach,maxlang/cockroach,glycerine/cockroach,maxlang/cockroach,glycerine/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,glycerine/cockroach,glycerine/cockroach,maxlang/cockroach,paperstreet/cockroach,maxlang/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,maxlang/cockroach