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This commit adds support for Kerberos authentication with a platinum license. Kerberos authentication support relies on SPNEGO, which is triggered by challenging clients with a 401 response with the `WWW-Authenticate: Negotiate` header. A SPNEGO client will then provide a Kerberos ticket in the `Authorization` header. The tickets are validated using Java's built-in GSS support. The JVM uses a vm wide configuration for Kerberos, so there can be only one Kerberos realm. This is enforced by a bootstrap check that also enforces the existence of the keytab file. In many cases a fallback authentication mechanism is needed when SPNEGO authentication is not available. In order to support this, the DefaultAuthenticationFailureHandler now takes a list of failure response headers. For example, one realm can provide a `WWW-Authenticate: Negotiate` header as its default and another could provide `WWW-Authenticate: Basic` to indicate to the client that basic authentication can be used in place of SPNEGO. In order to test Kerberos, unit tests are run against an in-memory KDC that is backed by an in-memory ldap server. A QA project has also been added to test against an actual KDC, which is provided by the krb5kdc fixture. Closes #30243