Bump src/acceptance-tests, src/cloud_controller_ng, src/dea_next

Bump :
  Eric Malm and Luan Santos:
     Update process type test to match DetectedStartCommand
Bump cloudfoundry/cloud_controller_ng:
  Eric Malm and Luan Santos:
     Use detected_start_command from staging task to return on apps endpoint ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/35681034 )
     Revert changes to execution_metadata behavior ( Travis Unknown )
Bump cloudfoundry/dea_ng:
  Eric Malm and Luan Santos:
     DEA returns detected_start_command rather than execution_metadata ( Travis Success: https://travis-ci.org/cloudfoundry/dea_ng/builds/35679628 )