[SD-1021] Implement Ingest Sequence Numbering
Merge remote-tracking branch 'upstream/master'
[SD-1021] Modified as per comments in PR
fix(ingest): send content to desk if any. Update to PR#449

1. archive_item() makes direct call to update() which overrides original_creator to '' and thus causing the item invisible in "MyContent"
2. When an item is fetched to a desk request to /api/archive_ingest will have 'desk' attribute in the request args and the same is persisted in Mongo. This is duplicate as 'desk' will be available as part of 'task'. So modified remove_unwanted() to remove 'desk' attribute