ISPN-4707 & ISPN-4717 Update Hot Rod views correctly when nodes leave

https://issues.jboss.org/browse/ISPN-4707
https://issues.jboss.org/browse/ISPN-4717
Actually, thinking this further, maybe for a next revision, there should be a single error code that indicates the need to failover, which covers all possible scenarios, e.g. node suspected...etc, as opposed to creating error codes for each and every situation. I'll send a PR to update documentation.