[Replace node playbook] scylla_servers.yml is not updated when use_nodetool_status_with_genconfig is used

[igorribeiroduarte]

In the replace_node playbook we update the monitoring before the start of the replace.
This is not a problem when use_nodetool_status_with_genconfig is false, since in this case we use the nodes in the inventory (which is already updated with the new node at this point) to generate scylla_servers.yml. But when this flag is true, nodetool status output will be used to generate scylla_servers.yml and this will result in the file having the old node instead of the new one.