Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Michael Fraenkel:
     Ignore Delayed Job failures when failing jobs ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/31354924 )
     Use INDEX to refer to the worker index ( Travis finished: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/31351357 )

Signed-off-by: Luan Santos <lsantos@pivotallabs.com>