Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Matt Royal and Zach Robinson:
     Return the number of instances moved [#63080352] ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/18845768 )
  Christopher Jobst and Ryan Moran:
     Adds new permissions endpoint for service instances ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/18826439 )
  David Sabeti and Derek Richard:
     Show an error when service ids are not unique within a catalog ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/18769136 )
     Do not show duplicate error messages ( Travis Unknown )