RFR: 1725: Clarify "no known role" error message

[Erik Joelsson]

On Thu, 19 Jan 2023 22:27:09 GMT, Zhao Song <zsong at openjdk.org> wrote:

> A user reported that when people review PRs, the bot adds a list of reviewers into description. If a user is not registered in OpenJDK Census, a note is added: 
> 
> (no known github.com user name / role) 
> 
> What it actually means is "no known OpenJDK user name / role".
> 
> Github.com is being used here because we are utilizing the name of the namespace. However, the purpose of the namespace is to map users from this namespace to either openjdk or internal. Actually, we couldn't find the user in openjdk or internal, not in the namespace. The census repository name can indicate whether it is openjdk or internal.

The jcheck configuration has a field `domain` in the `[census]` section, perhaps that would be a better description of the space we are looking for the user in? In the OpenJDK projects, this field has the value `openjdk.org` (internally we use oracle.com).

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PR: https://git.openjdk.org/skara/pull/1459