Add support for both OIDC and Kerberos auth (#26)
* Add support for both OIDC and Kerberos auth
Authentication would fall back to Kerberos/Negotiate if OpenID Bearer
token is not provided. This can be configured with the following
settings which overrides `AUTH_METHOD` option:
AUTH_METHODS = ["OIDC", "Kerberos"]
JIRA: RHELWF-7346
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