Bump src/dea_next:

Chris Brown and Mark Rushakoff (1):
      Add varz attribute for number of available stagers

David Sabeti and Jeff Schnitzer (2):
      Dea sends its index instead of its uuid during router.register
      Dea passes a Steno logger to VCAP::Component

Jon Stevens and Maria Shaldibina (1):
      Revert "DEA no longer snapshots it's entire state"

Luke Bakken (1):
      Ensure that the "Staging" logger uses the configured Steno level.

Mark Rushakoff (1):
      Merge pull request #26 from IronFoundry/staging-task-logging