Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Chris Piraino, Luan Santos and Mike Gehard:
     Refactor space presence validation out of AppModel ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/43891345 )
     Delete associated v3 app when deleting the last v2 app. ( Travis Unknown )