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db1f0d5889
When a new node joins the cluster we need to be sure that it's IP is known to all other nodes. In this patch we do this by waiting for the IP to appear in raft_address_map. A new raft_topology_cmd::command::wait_for_ip command is added. It's run on all nodes of the cluster before we put the topology into transition state. This applies both to new and replacing nodes. It's important to run wait_for_ip before moving to topology::transition_state::join_group0 since in this state node IPs are already used to populate pending nodes in erm.