Multi-valued Complex Fields with blob properties cannot be Edited when using CloudFront

When you have a multi-valued complex field with blob properties (such as files:files), you are not able to edit the field when using CloudFront.  The data URL becomes a CloudFront URL and PUT requests fail in this case.

Steps to Reproduce:

1. Set up an environment which uses CloudFront
2. Create a File document
3. Add an attachment
4. Observe that the first attachment uploads successfully
5. Try to add another attachment
6. Observe that the second attachment fails with a 400 error
   Looking at the PUT request, you will see that the data URL for the first attachment is a CloudFront URL. If you manually change the URL to something like

   "data":"http://localhost:8080/nuxeo/nxfile/default/<docid>/files:files/0/file/<filename>?changeToken=2-0"
   

   and try the PUT request again, it will go through successfully.

Note: When testing this on environments that had CloudFront and S3 Direct Upload, the data URL was not a CloudFront URL so everything worked successfully.