KuduSync does not delete files that were created by a failed deployment

[MarkBird]

We have encountered this a few times.

• file migrations/0026_auto_20190408_1538.py is added to source control and pushed to Bitbucket
• triggers deployment
• deployment fails
• we delete migrations/0026_auto_20190408_1538.py and push
• triggers deployment
• deployment still fails because the erroneous file still exists

I believe this is happening because on a failed deployment, the manifest is not saved, so when KuduSync looks for the previous manifest to determine what to delete, it doesn't see the file it should be deleting.