Add an extra escape wrapper for illegal XML chars in junit report plugin

[seberm]

The default Jinja escape (e) filter does not escape the XML illegal characters (like control characters). The python-xml-junit library was replacing the characters with an empty string:

• https://github.com/kyrus/python-junit-xml/blob/4bd08a272f059998cedf9b7779f944d49eba13a6/junit_xml/__init__.py#L325

For more info, please see:

• http://stackoverflow.com/questions/1707890/fast-way-to-filter-illegal-xml-unicode-chars-in-python
• https://www.w3.org/TR/xml11/#charsets

Pull Request Checklist

• implement the feature
• extend the test coverage
• include a release note

[psss]

Thanks for fixing this! Looks good and works as expected.

[seberm]

Thanks for fixing this! Looks good and works as expected.

Thanks for the review @psss !

Have you also tested the changes against the internal "base-os" tmt tests? Thanks.

[seberm]

/packit test

[psss]

Have you also tested the changes against the internal "base-os" tmt tests? Thanks.

Yes, before the change there's the traceback, with the change everything's green.

[psss]

/packit test