Adds optional NodeRangeScanSupport interface and implements it for the lucene scan store

This interface will allow the consistency checker to scan the label scan store in one pass instead of
having to do one pass per label.

Also removes SingleNodeDocumentLabelScanStorageStrategy (which is not used any more)
Merge pull request #1362 from boggle/2.0-node-range-scan-support

Adds optional NodeRangeScanSupport interface and implements it for the l...