More efficient deregistering by task #104
Merged
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Deregistering by task used to load all nodes (service instances) and loop over them in search for marathon task tag. With this change it loads all services and only loads nodes of services containing the marathon task tag.
It also correctly handles the corner case when there are multiple nodes containing the same marathon task id tag – it deregisters all of them. Before it would deregister only the first occurrence.