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CURATOR-710: Fix leaking watch in EnsembleTracker
CURATOR-667(#474) fixes asynchronous event path for getConfig to
"/zookeeper/config" by using CuratorFramework::usingNamespace(null) to
fetch data.
It causes watcher not registering to possible WatcherRemovalManager,
so leaking in WatcherRemoveCuratorFramework::removeWatchers.