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
GPII-1050: Some OAuth2 Express clean-up

- Address deprecation warnings
- Apply the body-parser at sites of usage rather than globally
GPII-17: First working driver for OAuth2-protected CBFM - this verifies just the very first stage of the interaction which issues a redirect to the URL /login - some hacks in the test driver for detecting top level executable since some machinery was omitted from GPII test driver