bump benchmarkbbs
bump benchmarkbbs

[finishes #135179235]

Submodule src/code.cloudfoundry.org/benchmarkbbs dd4569d6..1c1a3c1d:
  > route emitters subscribe to event stream
  > fix race condition in event counting / operation processing
  > add documentation for `local_route_emitters` property
  > update documentation for JSON configuration

Signed-off-by: Brandon Shroyer <d370be3f39cb88690ed16d1a7b77debc20949e86@pivotal.io>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release