set expiry according to parent item for associations (#2264)
set expiry according to parent item for associations (#2264)

so these are around when fetching the main item

SDCP-566
superdesk/superdesk-core,superdesk/superdesk-core,superdesk/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core