Add support for custom buildpacks
Merge branch 'upload_custom_buildpacks' of github.com:fraenkel/cf-release into fraenkel-upload_custom_buildpacks
Added buildpack blob store config.
Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  David Stevenson and Nick Wade:
     [#56371214] Pass syslog_drain_url down to DEA during app start ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11216686 )
     [#56371214] CC stores syslog_drain_url when returned by brokers during bind ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11215672 )
  Matthew Boedicker:
     Merge branch 'pr/86' ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11216272 )
  fraenkel:
     Prevent duplicate updates of a buildpack ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11212530 )
     Expose new buildpack and delete old when updating ( Travis Unknown )
     Refactor routes to simplify buildpack uploads ( Travis Unknown )
     Remove Model namespace ( Travis Unknown )
     Allow admins to retrieve build pack bits ( Travis Unknown )
     Allow buildpacks to have a priority ( Travis Unknown )
     Create the access rules ( Travis Unknown )
     Align the controller with the others. ( Travis Unknown )
  Georg Apitz:
     Adjust to new autoload style ( Travis Unknown )
     Add custom buildpack controller that takes a tar and adds it to a custom buildpack blobstore ( Travis Unknown )
  Phil Whelan:
     remove redundant background thread for SequelVarz ( Travis Unknown )
  Alex Choi and Ryan Tang:
     Fix service_provisioner test ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11206258 )
  Ian Lesperance:
     Use the progress formatter for rspec ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11082690 )
  Alex Choi and Matt Royal:
     Clean up the ServiceProvisioner and its tests ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/11080771 )
add properties for custom buildpacks bucket

[finish #56004592]
Merge branch 'fraenkel-upload_custom_buildpacks'