[202111][sonic-yang] fix the feature state type (#9587) #9778
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Signed-off-by: Stepan Blyschak stepanb@nvidia.com
Backport #9587
Why I did it
The feature state can be a jinja template, like in this file - https://github.com/Azure/sonic-buildimage/blob/master/files/build_templates/init_cfg.json.j2#L39.
Without this change it is not possible to validate a configuration file.
How I did it
Relaxes the constraint on feature state. Feature state leaf can be any string.
How to verify it
Run UT.
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)