Add hostname and timestamp to JUnit XML testsuite tag

[samueljsb]

• Target the master branch for bug fixes, documentation updates and trivial changes.
• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.

Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.
• Add yourself to AUTHORS in alphabetical order;

[nicoddemus]

Thanks!

Great patch!

The change conforms to xunit2. 👍

Some changes though:

• os.uname is not available on Windows. I believe platform can provide a suitable alternative.
• Please target features, as this is a new feature and not a bug-fix.

Also it would be great if we could merge this after #5605, but that depends on us.

Thanks again!

[codecov]

Codecov Report

Merging #5692 into features will increase coverage by 0.28%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #5692      +/-   ##
============================================
+ Coverage     94.53%   94.82%   +0.28%     
============================================
  Files           117      117              
  Lines         25827    25843      +16     
  Branches       2495     2495              
============================================
+ Hits          24416    24505      +89     
+ Misses         1072     1017      -55     
+ Partials        339      321      -18

Impacted Files	Coverage Δ
testing/test_junitxml.py	98.18% <100%> (+0.03%)	⬆️
src/_pytest/junitxml.py	95.85% <100%> (+0.61%)	⬆️
src/_pytest/fixtures.py	97.5% <0%> (+0.27%)	⬆️
testing/test_config.py	99.85% <0%> (+0.29%)	⬆️
testing/test_terminal.py	98.43% <0%> (+0.31%)	⬆️
testing/python/fixtures.py	99.08% <0%> (+0.57%)	⬆️
testing/test_parseopt.py	97.93% <0%> (+0.82%)	⬆️
src/_pytest/config/findpaths.py	95.09% <0%> (+0.98%)	⬆️
testing/acceptance_test.py	98.02% <0%> (+0.98%)	⬆️
... and 8 more

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[samueljsb]

@nicoddemus I've made the changes - I had forgotten about os.uname on Windows!