avocado.utils.kernel: fix kernel version parsing #3032

Job	Run time
macOS with Python 3.11.1	10m 24s
Static checks	1m 50s
Build Egg for Python 3.8	9s
Build Egg for Python 3.9	7s
Experimental checks	15s
Build Egg for Python 3.10.0	19s
Build Package (wheel/tarball) for Python 3.8	54s
Build Egg for Python 3.11	13s
Smokecheck on Linux with Python 3.8	28s
Build Package (wheel/tarball) for Python 3.9	56s
Build Egg for Python 3.12.0	23s
Smokecheck on Linux with Python 3.9	26s
Build Package (wheel/tarball) for Python 3.10.0	55s
Windows with Python 3.9	51s
Smokecheck on Linux with Python 3.10.0	35s
Build Package (wheel/tarball) for Python 3.11	46s
Windows with Python 3.10.0	2m 3s
Version task fedora:37	3m 23s
Smokecheck on Linux with Python 3.11	1m 43s
Windows with Python 3.11	1m 1s
Build Package (wheel/tarball) for Python 3.12.0	1m 9s
Smokecheck on Linux with Python 3.12.0	33s
Windows with Python 3.12.0	2m 19s
Egg task debian:12.4	23s
Egg task fedora:37	59s
Egg task fedora:38	44s
Egg task ubi:8.8	16s
Egg task ubi:9.2	15s
Version task debian:11.0	25s
Version task debian:12.4	2m 3s
Version task fedora:38	3m 4s
Version task ubi:8.8	1m 54s
Version task ubi:9.2	20s
Version task ubuntu:20.04	28s
Version task ubuntu:22.04	2m 6s
Egg task debian:11.0	17s
Egg task ubuntu:20.04	19s
Egg task ubuntu:22.04	16s
Fedora develop install/uninstall task	2m 26s
Fedora selftests	7m 59s
Podman Egg task	12s
Podman spawner with 3rd party runner plugin	48s
Linux with Python 3.8	8m 27s
Linux with Python 3.9	8m 40s
Linux with Python 3.10.0	9m 41s
Linux with Python 3.11	9m 53s
Linux with Python 3.12.0	9m 6s
	1h 42m 43s

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