We plan to stop storing IP addresses in Raft configuration, and instead
use the information disseminated through gossip to locate Raft peers.
Implement patches that are building up to that:
* improve Raft API of configuration change notifications
* disseminate raft host id in Gossip
* avoid using Raft addresses from Raft configuraiton, and instead
consistently use the translation layer between raft server id <-> IP
address
Closes#11953
* github.com:scylladb/scylladb:
raft: persist the initial raft address map
raft: (upgrade) do not use IP addresses from Raft config
raft: (and gossip) begin gossiping raft server ids
raft: change the API of conf change notifications
d7649a86c4