Disable tests using excluded files with dubious license. This patch follows the according issue in tryton-modules-account-payment-sepa with The origin of the xsd/xml test files is unclear, but most probably they should be distributed under the terms specified at https://www.iso20022.org/intellectual-property-rights or https://www.iso20022.org/terms-use . As Tryton upstream is sadly unresponsive in declaring the origin and/or license of the files we assume the origin as cited above and therefore remove them, because they are not compatible with DFSG. For that reason we have to disable all tests relying on those files.
