add testing mode affordances to spec and/or docs

[catkins-miso]

Ratings Obligation profile:

• well-known testing identities and associated data
• plain-text (CIM XML RDF?) and extensible
• can be loaded at start-up if configured to start in Testing Mode

Supports an X-TROLIE-Testing-Identity header while in Testing Mode

• Header is used to identify a well-known identity from the testing model
• Implementations SHOULD return a 500 response if header present when not in testing mode

Testing Mode loads an alternate DateTime Provider implementation

When X-TROLIE-Testing-Current-DateTime has a valid RFC 3339 value, that value is used for the duration of request processing. If the header is present but doesn't have a valid value,

Testing Mode Clearinghouse Provider

In Testing Mode an alternate Testing Clearinghouse Provider should be loaded. This provider should support verification of proposals under the testing Ratings Obligation profile.

[caindy]

consider specifying a header, e.g., X-TROLIE-Test-Required-Units, or some other affordance for conformance tests to force the proper validation