RE: GÉANT OIDC -plugin first and hopefully last beta

[Cantor, Scott]

> This beta release requires Shibboleth 3.4+. This is the first release that may be
> installed on top of existing Shibboleth IdP installation by following the
> instructions on https://github.com/CSCfi/shibboleth-idp-oidc-
> extension/wiki/Installing-from-archive

We should ideally also use this test case to motivate some design changes to the installation process to better support this kind of operation.

-- Scott