Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Ruth Byers:
     Removed dummy job ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/17075920 )
     Add timeout to rest of CC jobs; improve tests ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/17034639 )
     Add timeout to AppEventsCleanup job ( Travis Unknown )
     Add timeout to AppBitsPacker job ( Travis Unknown )
     Add TimedJob module for CC jobs ( Travis Unknown )
  John Tuley:
     Add job to prune old (audit) Events ( Travis Unknown )
  Christopher Jobst and Zach Robinson:
     Move client logic out of http_client and into client. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/16970494 )
  Phan Le:
     Mapping a shared domain to an org is backward compatible. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/16903951 )