[Federation] Correct the Entity statement "metadata_policy" definition to allow its use in explicit registration

[Vladimir Dzhuvinov]

https://openid.net/specs/openid-connect-federation-1_0.html#name-entity-statement

metadata_policy

OPTIONAL. … Only non Leaf Entities MAY contain a metadata_policy claim…

An OP’s explicit registration response, where the subject, i.e. the RP, is a Leaf, may use the metadata_policy claim according to the current spec. The definition needs a correction to reflect this special case.

https://openid.net/specs/openid-connect-federation-1_0.html#name-client-registration-respons

[Vladimir Dzhuvinov]

This will be resolved in the next PR that addresses a number of issues related to explicit client registration.

[Michael Jones]

Was this resolved by https://bitbucket.org/openid/connect/pull-requests/609 or do we still need an additional PR?

[Vladimir Dzhuvinov]

Marking as resolved by PR 609.

The explicit registration response ES no longer makes use of a "metadata_policy" claim.