GPII-17: First pass at OAuth2-integrated cloud-based flowManager. This passes a "smoke test" of running the standard acceptance tests against the existing cloud-based flow manager (and old endpoint) but other than this has no verified functionality other than not exploding immediately. Moved some more OAuth2 materials into "examples" as well as renaming the "userToken" flowManager grade and improving some commenting
GPII-1050: Updates for gpii-oauth2 moves to /examples

- gpii-oauth2-single-process-auth-server
- gpii-oauth2-resource-server
GPII-1050: Rename gpii-oauth2/config.js to oauth2SamplesConfig.js