Do not validate time when handling unexpected NotBefore attribute #394
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According to http://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf, the SubjectConfirmation element MUST NOT contain a NotBefore attribute. SAML2Utils correctly throws an exception when NotBefore is present, however before doing so, it also checks time validity against the attribute value! This does not make sense.