Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  David Sabeti and Ryan Moran:
     Do not export system_env_json with get /v2/app/:guid response [finishes #55332776] ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/18290202 )
remove etcd from hm9000 job