Operator sets incorrect Alternate Address after reconcile

After reconciling after a topology change in the cluster, the incorrect externalPorts are set for all nodes.

For example:

*Before*

{

  "external":{

    "hostname": "cb-example-0000.cb-example.marabine.co.uk"

  }

}

*After*

"alternateAddresses":{

  "external":{

    "hostname": "cb-example-0000.cb-example.marabine.co.uk",

    "ports":{

        "mgmtSSL":30024, 

        "cbasSSL":32499, 

        "ftsSSL":30091, 

        "kvSSL":30721, 

        "capiSSL":31127,

        "n1qlSSL":30605

    }

}

Steps to Reproduce
1. Setup a cluster with public connectivity (i.e. DNS + LoadBalancer exposedFeatureServiceType).
2. Wait for cluster to be setup and all pods to be marked ready.
3. Manually failover a Couchbase Server node (works if you delete the pod too, but takes longer).
4. Check the alternateAddresses set on Couchbase Server /pools/default/b/<bucketname>.