[action] [PR:16733] [fast-reboot] Fix regression: set state_db flag to support fast-reboot from older images #16754
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Why I did it
Fix: #16699
Fast reboot is failing from old OS versions (eg., 201911 image) to latest (eg., master branch) after PR #15685
The system wide flag for FAST_REBOOT is still required when the base OS version does not support the new fast-reboot reconciliation logic (no db dump)
Work item tracking
How I did it
Set system flag for fast reboot during boot up path
How to verify it
Change restores the state as it was before PR 16225, and fast-reboot worked before 16225
Manual tests are in progress.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)