toString() cleanup and fix PollableNode.delete()
indent/format
NMS-6848 make poller event processing handle deltas better
whups, did not mean to add this test annotation
NMS-6848 fix outage-handling in Pollerd

When receiving an event for category or asset changes, the Poller was
unconditionally removing any active outages for the provided node.
Now it handles it conditionally, based on whether the interface/service
is still monitored.

Merge remote-tracking branch 'origin/jira/NMS-6848' into rc/stable/1.14.0