Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Phan Le:
     Change app routes cleaning up script ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15781881 )
     Log tests runtime to distribute test evenly ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15751456 )
     Deleted the route associations for soft deleted deleted apps. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15745740 )