[minigraph] Add downstreamsubrole parsing to 20911 minigraph.py (#7193) #7514
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Why I did it
So that downstreamsubrole values can be used for policies. Backport PR, same as #7193
How I did it
Added downstream_subrole to DEVICE_METADATA section of config_db
How to verify it
Unit testing in sonic-config-engine
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)