Simon Willnauer a9a2753f0b Add a HostFailureListener to notify client code if a node got disconnected (#21709)
Today there is no way to get notified if a node is disconnected. Client code
must poll the TransportClient constantly to detect that a node is not connected
anymore in order to react and add new nodes or notify altering etc. For instance
if a hostname  gets resolved to an IP but that host is disconnected clients want
to reconnect by resolving the hostname again which is a common situation in cloud
environments.

Closes #21424
2016-11-22 20:46:28 +01:00
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