Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Matt Royal and Ryan Tang:
     Set ServicePlan#extra from v2 broker catalog metadata ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/12962017 )
     Test service plan name & description for v2 brokers ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/12962001 )
     Small refactor ( Travis Unknown )
     Set Service#extra from v2 broker catalog metadata ( Travis Unknown )