Don't use generic header "X-NXfetch.document": "properties"

Using this header with generic 'properties' instead of a list of properties resolves all external entities and will cause performance problems later,

see https://jira.nuxeo.com/browse/NXP-16066 for all the fields that are resolved

I think we can send a list where we need it .
For example on the deliverable items:
headers='

{"X-NXfetch.document": "deliverable_item:format,deliverable_item:publicationTarget,deliverable_item:size", "X-NXtranslate.directoryEntry": "label"}

'

( not sure about the synatx)