chunk calls to policy client in policy server perf test
chunk calls to policy client in policy server perf test

* Our policy client chunks requests. But the UAA token was expiring in
  the middle of the calls to the policy client. By chunking the calls,
  we're reducing the chance of the UAA token expiring.

[#140352859]

Signed-off-by: Jay Dunkelberger <935fea2bc25e407ead5a8f270927e82e1e7c05de@pivotal.io>

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