Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers and Mike Gehard:
     Check if migrations have been run before loading models ( Travis Unknown )
  Joseph Palermo and Zach Robinson:
     Fix i18n translations when passed an array for the argument Change StagingError to use default rather than generic ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/43519863 )
  David Sabeti and Ketan Deshpande:
     Fix issue with services event repository ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/43511520 )
     Fix names for service broker examples in events api spec ( Travis Unknown )
     Formatting change ( Travis Unknown )
     Add audit events for user_provided_service_instance ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/43504308 )
     Prevent moving service instances between spaces [#84152630] ( Travis Unknown )
  Michael Maximilien and Whitney Schaefer:
     Fixed where we record the audit event for delete service plan visibility ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/43509220 )