Ensure clusterInfoMap does not become empty when external LB is given

[ashetkar]

What:

• clusterInfoMap holds the information of each node (value of the entry) of the cluster against its address (key of the entry)
• When the address given in connection string does not match with either the host value or the public_ip value of the node, the driver saves the information of the node against its public_ip and removes the entry saved against its host value.
• But if host and public_ip values are same, the clusterInfoMap was losing the entry if the remove() operation is done after put() operation. So reversed the sequence.

Why:

• This was causing the driver to not load balance the connections in a setup where a load-balancer endpoint is given in the connection string and the private and public addresses of a server are same
• GH Issue: [JDBC Smart driver] Handle a case where there is a load balancer in front and server's private address is same as its public address yugabyte-db#25153

Testing:

• Verified the fix with the app which reproduced the issue
• Existing tests pass

[HarshDaryani896]

LGTM