We are going to remove the IP waiting loop from topology_state_load
in subsequent commits. An IP for a given host_id may change
after this function has been called by raft. This means we need
to subscribe to the gossiper notifications and call it later
with a new id<->ip mapping.
In this preparatory commit we move the existing address_map
update logic into storage_service so that in later commits
we can enhance it with topology_state_load call.
15b8e565ed