Handle SQLException caused by IOException during delegated connection creation

[AndreyLebedenko]

Consider the following scenario:

1. Driver queried the cluster for RO replicas' endpoints.
2. N records returned of 'active' state.
3. N records added to the list.
4. X RO replicas went down.
5. Application requests connection to be established.
6. Driver pulls record which points to the replica, which is no longe accessible.
7. Driver tries to open JDBC connection.
8. Driver receives SQLException with IOException as cause.

Need to add logic which will:

1. Handle exception and try to open the connection to the healthy address, respecting the general distribution logic.
2. Optionally: Remove those records from the list or somehow mark it as down.