bump benchmarkbbs
bump benchmarkbbs

[finishes #137699707]

Submodule src/code.cloudfoundry.org/benchmarkbbs fec30a47..f4dbce66:
  > Merge remote-tracking branch 'origin/pr/2'

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

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