Remove inert mutual auth request and javadoc-only import - #7281

requestMutualAuth(true) asked for mutual authentication that was never established: the proxy's response token is never consumed, so there is nothing to verify it against. Preemptive single-leg Negotiate cannot verify it either, so the call is dropped rather than wired up.

The com.sun.security.auth.module.Krb5LoginModule import existed only to satisfy a javadoc {@link}. Referring to the class by name in {@code} instead keeps the documentation while dropping a compile-time reference to a JDK-implementation-specific class.

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

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• Local run of mvn install succeeds
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• My change requires a change to the Javadoc documentation
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