avocado.utils.kernel: fix kernel version parsing #6069
Merged
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This fixes two problems with the current version parse mechanism:
Recent setuptools' version parse function, which has dropped "LegacyVersion" support, raises an InvalidVersion exception for common kernel version info as presented by the system and returned by os.uname()
The import of the packaging module is broken on systems with no setuptools and only the "packaging" module.
This introduces a simple but custom version parse that solves both and simplifies dependencies.
Fixes: #6058