Validation does not cover all tokens

[mshriver]

It appears, through use in robottelo, that testimony does not validate all tokens defined in docblocks, validating the compiled/squashed tokens only.

If your configuration includes choice options for a token like :TestToken:, and you define a module level docblock token value that is invalid, that token value is not validated if all classes/functions within the module specify a valid TestToken value.

I think that the validation should cover all docblock tokens, before they're compiled/squashed at the function level. Using testimony to assist with code review through CI validation of the docblocks will miss potential typos at these higher scopes.

I can provide a PR updating the unit tests to demonstrate this behavior if you would like, but I thought it best to start an issue to discuss this behavior before making any code changes.