deleted unnecessary files in junit-xml folder. Added distro/python3 to c-fortran-test-hardware.yml
some clean-up
updated test/junit-xml folder (copied from Ratel).
junit-xml: avoid "six", which may not be installed
Merge commit '71c263ca3a3ce57731d1f7a04e93e4c31116f80b' as 'tests/junit-xml'