results: expose errors under element for testcases

Miroslav Vadkertirequested to merge
results-xunit-error-testcase into results-fix-counting-of-skipped-failed-tests

We used <failure> element for errors, which seems wrong and causing confusion. Seems errors are normally recognizable in xunit and one can use the <error> element.

Signed-off-by: Miroslav Vadkerti mvadkert@redhat.com

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