prop=duplicatefiles does not show duplicates under same name

prop=duplicatefiles does not show duplicates under same name

When under the same name on the repo a file exist, with the same hash,
prop=duplicatefiles does not list this file.
Checking also isLocal, when looking for the file itself helps.

Adding also a shared='' to indicate, that the duplicate with same name
is not the file itself.

Follow up I745cae7a

Change-Id: I4e613cb6d592521befe8bc876e251a89b3fa3047