add file generation methods to directory server

Change-Id: I50bdd9a4eaa1eee4a3a6032d526eb6209a71cab5
return streaming log url from async stage responder

Change-Id: I73f6857835f7c6055f8a432fe0648ac1c542e3f2
updated config/dea.yml so that dea can start locally

Change-Id: I809b96d88069349f484c639db77e032aeaaaa0c3