Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers:
     Fixing usage event cleanup ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25831896 )
     Replacing Sequel::Model::Dataset delete with destroy ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25825447 )
     API version bump after rebase ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25806444 )
     Use auto_savepoint rather than savepoint ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25744651 )
     BlobstoreUrlGenerator stub is more resilient. ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25740745 )
     Protect space spec from flakes ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25732877 )
     Revert commits that increased CC flakes. ( Travis Unknown )
     Improve expectations in service_instances_controller_spec to be less flakey ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25713003 )
  Chris Adams:
     Bump vendor/errors for new staging failure reasons ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25813003 )
     Merge pull request #241 from sykesm/detect-failure-message ( Travis Failed: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25811052 )
  Derek Richard:
     Change redaction value from string to key val ( Travis Unknown )
  Leo Rossignac-Milon and Zach Robinson:
     Bump cc api version. ( Travis Unknown )
     Allow service instances to be queried by organization guid. ( Travis Unknown )
  Hristo Iliev and Leo Rossignac-Milon:
     Reverted bump on API version ( Travis Unknown )
     Validate system env contains only VCAP_SERVICES ( Travis Unknown )
     App endpoint now returns redacted environment ( Travis Unknown )
     Fixed an app_access_spec test description ( Travis Unknown )
  Derek Richard and Leo Rossignac-Milon:
     Protect /v2/app/:guid/env to only allow SpaceDev ( Travis Unknown )
     Backfill tests for service_instance_access ( Travis Unknown )
  Matthew Sykes:
     Bump ruby version to 1.9.3-p545 ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25793524 )
     Carry app staging failure reason into ccdb ( Travis Unknown )
  Alex Suraci:
     include health check timeout in diego desire msg ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25745691 )
     include routes in desire app message ( Travis Unknown )
  Abhijit Hiremagalur:
     Remove ModelManager in spec_helper ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25560673 )
  Karl Isenberg:
     Added create hook to ModelManager ( Travis Unknown )
     Added cleanup of some leaky tests ( Travis Unknown )
  Onsi Fakhouri:
     Added number of instances in diego.desire.app request ( Travis Unknown )

Signed-off-by: Nicholas Calugar <ncalugar@pivotallabs.com>