[Openid-specs-ab] Issue #1523: [Federation] request_parameter_supported (openid/connect)

[Takahiko Kawasaki]

New issue 1523: [Federation] request_parameter_supported
https://bitbucket.org/openid/connect/issues/1523/federation-request_parameter_supported

Takahiko Kawasaki:

The configuration of `op.umu.se` in A.2.8 of OpenID Connect Federation 1.0 says that `request_parameter_supported` is `false`, but the authentication request in A.3.1 is using the `request` parameter.

The configuration of `op.umu.se` should say that `request_parameter_supported` is `true`.

In addition, because the default value of `request_parameter_supported` is `false` \([OIDC Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html) [Section 3](https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata)\), the configuration of `op.umu.se` shown in A.2.1 should explicitly include `"request_parameter_supported":true`.