[process-reboot-cause] If software reboot cause is unknown add note if first boot into new image #4538
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If no software reboot cause can be determined (i.e.,
REBOOT_CAUSE_FILE
doesn't exist), andFIRST_BOOT_PLATFORM_FILE
exists, it is very likely the device just booted up after a fresh SONiC image installation. In this case, we add a note in the reboot cause string.