[202311] Enable iburst option for NTP servers loaded from minigraph (#19424) #19741
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Backport of #19424 to 202311 branch.
Why I did it
In #15058, the NTP server configuration was modified to add additional options, such as conditionally enabling iburst, specifying the association type, and specifying the NTP version. One side effect of this was that the iburst option which was previously always enabled now requires it to be explicitly enabled in the config_db.
Fixes #19425.
Work item tracking
How I did it
To restore the old behavior, when loading from minigraph, add "iburst": "true" for each NTP server loaded from minigraph.
How to verify it
Tested on a KVM setup, verified that the generated ntp.conf file had the iburst option.
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)