scaling test gets all policies only once
scaling test gets all policies only once

* getPolicies had been getting policies per sourceApp, hence was
  slow

[#128819469]

Signed-off-by: Genevieve LEsperance <1b6a7b865633211adcfeed81fa254bd2ba36f0db@pivotal.io>

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