Confluence DC 7.3+ does not ship with OIDC option

Issue Summary

According to OpenID Connect for Atlassian Data Center applications, OpenID Connect ("OIDC") is built in to Confluence 7.3 and newer. That's not actually the case. The binaries I tested shipped with atlassian-authentication-plugin-3.2.1.jar, which doesn't include the OIDC option.

Steps to Reproduce

1. Install Confluence DC 7.3+
2. Run over SSL
3. Navigate to SSO 2.0 screen
4. Select the "OpenID Connect single sign-on" option

Expected Results

You can select and save the OIDC configuration

Actual Results

The OIDC option does not exist

Workaround

Install version 4.0.1+ of the SSO for Atlassian Server and Data Center plugin (for Data Center):

• Stop Confluence
• Replace the existing plugin with version 4.0.1+ at confluence-installation-directory/confluence/WEB-INF/atlassian-bundled-plugins
• Restart Confluence