Reduce number of parallel workers in scaling test
Reduce number of parallel workers in scaling test

* We saw 404s and 502s likely due to not being able to keep up
  with the request load

[#128819469]

Signed-off-by: David McClure <f2d486abbc9bad1727caf3ba835e0fcc02bb2355@pivotal.io>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release