Added check for Dummy nodes available in Sample file.

- Test cases for Samples were not having any kind of verification other than Number of Nodes and Connectors.  So the first thing I did, I have added check for Dummy nodes in Sample. After this change there are few Samples which are failing now.

- Updated Revit file path for few samples which was using specific Revit file.

- There are few dyn files which was having Version 0.7 and because of that those were not migrating correctly, so I have changed that version to 0.6 and now those are getting migrated correctly.

In next check in I will add more verification for the Samples which are passing now.