Another node can stop after it joined the group0 but before it
advertised itself in gossip. `get_inet_addrs` will try to resolve all
IPs and `wait_for_peers_to_enter_synchronize_state` will loop
indefinitely.
But `wait_for_peers_to_enter_synchronize_state` can return early if one
of the nodes confirms that the upgrade procedure has finished. For that,
it doesn't need the IPs of all group 0 members - only the IP of some
nodes which can do the confirmation.
This pr restructures the code so that IPs of nodes are resolved inside
the `max_concurrent_for_each` that
`wait_for_peers_to_enter_synchronize_state` performs. Then, even if some
IPs won't be resolved, but one of the nodes confirms a successful
upgrade, we can continue.
Fixes#13543Closes#14046
* github.com:scylladb/scylladb:
raft topology: test: check if aborted node replacing blocks bootstrap
raft topology: `wait_for_peers_to_enter_synchronize_state` doesn't need to resolve all IPs
aa2ccb3ac4