ulimit to a smaller number on cedar vm
ulimit to a smaller number on cedar vm

* We ran into issues running cedar_script, could not modify the limit to
be a number this large

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

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