public static AcceptableUsagePolicyStatus skipped(final Principal principal) {
        return new AcceptableUsagePolicyStatus(TriStateBoolean.UNDEFINED, principal);
    }
Factory method. Indicate AUP has been skipped with unknown/undefined status.

@param principal the principal
@return the acceptable usage policy status
support/cas-server-support-aup-core/src/main/java/org/apereo/cas/aup/AcceptableUsagePolicyStatus.java