Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Matthew Sykes:
     Disable rubocop's 'CyclomaticComplexity' cop ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/41640090 )
     Fix up diego flag after env variable rename ( Travis Unknown )
  Jeff Hui and Whitney Schaefer:
     Service Broker events mark auth_password as REDACTED if set. ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/41635476 )
  David Sabeti and Jeff Hui:
     Add Repositories::Services::EventsRepository to generate audit events related to services ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/41631801 )
     Add test to ensure that only an admin can see broker audit events ( Travis Unknown )