Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Jimmy Da:
     Remove unused test and update test example description ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15561884 )
  Ruth Byers:
     Add debug print out for debugging flakey test. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15557691 )
     Clean up domains in cloud controller ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15557132 )
     Fix /v2/domains/<guid>/spaces ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15551326 )
     Reseed database correctly in tests. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/15428026 )
     Remove app memory default. ( Travis Unknown )