Adapt migrate_7x_claw to work with latest CLAW

[dannylamb]

https://github.com/Islandora-Devops/migrate_7x_claw will need to be touched up to account for the latest flysystem changes that have been merged into 8.x-1.x.

[rtilla1]

Sprint Kick-off: There are a lot of changes that rolled through last week, and patches to that work will need to be made. We do not know what this will require, so sub-tasks will be created as we go.

[patdunlavey]

Assign me please. @whikloj is this something you can provide leadership on?

[whikloj]

I was able use the existing code to migrate 6 basic images from 7.x to CLAW.

Structure of the objects seems correct and the OBJ has the proper Preservation Master tag which caused the Service File and Thumbnail to be generated.

What is missing is that the OBJ should have gone to Fedora but is in Drupal as it now needs the fedora: scheme to use the flysystem changes.

[dannylamb]

This is working for now, and i'm going to make follow up tickets.