Shared storage was duplicating across polling cycles because the ID
included the node name of whichever node reported it first. When a
different node reported first on the next cycle, a new ID was created.
This fix updates the shared storage aggregation to use a consistent ID
format (instance-cluster-storageName) that doesn't include the node name.
Closes#1049. Thanks to @siccous for the report and initial investigation.
rcourtman
06ebaf50b2