Bump dea_next.

$ git shortlog 41e7cc..687ecc

Dmitriy Kalinin and Kowshik Prakasam (7):
      add file generation methods to directory server
      return streaming log url from async stage responder
      updated config/dea.yml so that dea can start locally
      moved FileApi into DirectoryServerV2 namespace
      renamed FileApi to InstancePaths
      renamed FileApi to InstancePaths
      Revert "Remove legacy directory server"

Change-Id: I0f898094263cb7f4948c1de34f3d707b1c173846