Initial commit. Make cf env return the value of vcap_services. Exposed a
new system_env_json variable on the existing endpoint for
system environment variables, currently containing only VCAP_SERVICES.
Merge branch 'vcap_services_env_variable' of github.com:jberkhahn/cloud_controller_ng
PR #146   [#63676232]
Make tests more explicit about white listing intentions. [#63676232]