Add logout support for OIDC in authn delegation

[leleuj]

After a delegated authentication at an OIDC provider, if this OIDC provider sends a logout request to the CAS server, the CAS server does not perform a CAS logout. It works for SAML though.

This PR fixes the problem and adds a test to confirm the behavior.

[leleuj]

I will investigate on failing tests.

[leleuj]

I think the Publish documentation issue is not related to my change.

[leleuj]

The delegation issue:

Execution failed for task ':support:cas-server-support-pac4j-webflow:testDelegation'.
> Failure closing session
  Standard error from JVM:
      OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended

does not seem to be related to my change either.

[leleuj]

Re-running failing tests to confirm the outcome...

[leleuj]

After re-running the failing tests, the SAML2 tests pass while the delegation tests still don't but I see the same issue on the master. Thus, I consider that this PR is not the culprit. Keep me posted if you need me to fix something in any case...

[mmoayyed]

Thank you, sure. I'll take a look shortly.

[mmoayyed]

This generally looks OK, thank you. I am in the process of moving OIDC/SAML2 functionality out of the main module for delegated authn, and when done, I'll also merge and include this changeset there in the final result. I am hoping to do this before the weekend.

[leleuj]

Good! Thanks

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[mmoayyed]

This is merged into the master branch