WARNING on JMX Client Heartbeat

[liwang0513]

Deleting DC will causing warnings as below:

17:25:58.041 [JMX client heartbeat 3] WARN  c.i.c.o.j.CassandraConnectionFactory - JMX connection to /172.17.0.4 unexpectedly failed. javax.management.remote.JMXConnectionNotification[source=javax.management.remote.rmi.RMIConnector$RMIClientCommunicatorAdmin@341b15ad][type=jmx.remote.connection.failed][message=Failed to communicate with the server: java.net.NoRouteToHostException: No route to host (Host unreachable)]
17:26:01.170 [JMX client heartbeat 3] WARN  javax.management.remote.misc - Failed to check connection: java.net.NoRouteToHostException: No route to host (Host unreachable)
17:26:01.171 [JMX client heartbeat 3] WARN  javax.management.remote.misc - stopping

[zegelin]

I'll look into this -- I need to modify the healthcheck service to only test running pods