PutAzureEventHub blocks after network interruption

PutAzureEventHub will block after a network interruption due to a bug in the underlying azure-eventhubs [1] and qpid-proton [2] libraries. This was fixed in proton 0.15.0 and event hubs 0.9.0 so the NiFi dependency needs to be bumped from 0.7 to 0.9.

The errors are:

o.a.n.controller.StandardProcessorNode Timed out while waiting for OnScheduled of 'PutAzureEventHub' processor to finish.

servicebus.trace UnHandled exception while processing events in reactor: java.lang.IllegalArgumentException

1. https://github.com/Azure/azure-event-hubs-java/issues/18
2. https://issues.apache.org/jira/browse/PROTON-1275