[201803][reboot] log reboot progress and add sanity check #527
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- What I did
Signed-off-by: Ying Xie ying.xie@microsoft.com
- How to verify it
Verified that reboot process is logged in syslog.
Verified that read-only file system will generate log but don't prevent reboot.
verified that non-existing next-boot image will stop reboot.