Project: duracloud
Issue DURACLOUD-1024: In the CleanUpSnapshotTask,  read all items before generating delete messages
Currently the CleanupSnapshot task streams manifest items using a streaming iterator. For each item, a delete audit message is generated. Under the covers the manifest item streamer pulls items in 10K item pages. If the manifest processor in the mill begins working the list before all pages have been pulled, the manifest streamer will miss some records. To resolve, write entire list of content Ids to file before generating audit tasks.
Story points: 1