Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Phan Le & Tim Labeeuw:
     Bump DJ Sequel to prevent race condition with 2 workers picking up same job ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/13224934 )
     Revert "Remove what appears to be mistake code" ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/13221660 )