Bump dea_next and yeti

git shorlog dea_next: 4c4fa1..98bce9
Alex Suraci and Dmitriy Kalinin (4):
      break connection when file being tailed is deleted
      simplify stream_handler for loop
      flush content before starting to tail a file if custom tail offset is given
      stop serving tail http request after timing out

Dmitriy Kalinin and Jesse Zhang (4):
      increase idle timeout in the tests to make Travis happier
      Revert "increase idle timeout in the tests to make Travis happier"
      explain why connection needs to be hijacked by stream handler
      end streaming file when file is deleted

Dmitriy Kalinin and Kowshik Prakasam (1):
      make sure that staging_task.log is created before staging setup completes

Max Brunsfeld and Scott Calvert (1):
      Use foreman in directory server integration specs

git shortlog yeti: 09d6a2..9dcc75
Dmitriy Kalinin and Jesse Zhang (1):
      add test for async staging

Change-Id: Id86d24e7d66880db319a0824a193c31fc65f05b0