Handle default kernel cmdline if multiple boot entries for the default kernel are defined #4125

Job	Run time
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.12...	40s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 14s
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.9,...	32s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 12s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.9, ...	32s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	1m 25s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.6, ...	37s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	3m 20s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 3.6, ...	47s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 3...	4m 10s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 2.7, ...	50s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 2...	5m 39s
	20m 58s

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