example-apps/tick: integration test uses deterministic ports
example-apps/tick: integration test uses deterministic ports

- parallel nodes use non-overlapping port ranges
- should eliminate test flakes

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