[process-reboot-cause]Clean up the process-reboot-cause #4128
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- What I did
Clean up the process-reboot-cause as mentioned in Propose a further code clean up on top of PR #3880
- How I did it
Calculate command line (/proc/cmdline) reason and log.
Calculate hardware reason and log.
Calculate software reason and log
Decide the final reboot cause in the following logic:
If there is a /proc/cmdline reboot cause, use the software reason as the reboot cause;
elif there is a hardware reason, treat it as the reboot cause
else treat the software reason as the reboot cause.
- How to verify it
reboot and check the reboot cause in the following order:
- Description for the changelog
- A picture of a cute animal (not mandatory but encouraged)