Create a home for sample/testing payloads and expected response data

[oubiwann]

Tasks:

• Create the following directories:
  • test/data/payloads
  • test/data/responses
• Add at least one of each (as basis/inspiration, use files from system-int-test or cmr-demos)
• Update the :test profile to include test/data in its :resource-paths
• Add data functions for extracting payload and response information from the appropriate resource paths
• Create test/clj/cmr/client/testing/data.clj
  • Add a function for getting payload content (using io/resource)
  • Add a function for getting response content (using io/resource)