[fast-reboot] save fast-reboot state into the db #780
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Fixes sonic-net/sonic-buildimage#4006
1.(This PR) save fast-reboot state into the db when execute fast-reboot(aligned with sonic-net/sonic-buildimage#3741)
2. (sonic-net/sonic-buildimage#4008)Later, during the syncd service stop stage,
sonic-buildimage/files/scripts/syncd.sh
could detect theFAST
mode by the saved state, and request syncd to trigger fast shutdown.