grl-metadata-key: Comment broke keys generation
The generate_core_keys.py script was matching with the GRL_METADATA_KEY_ part in the comment and broke.
Leave out the common key part in the comment to stop the script tripping.
The generate_core_keys.py script was matching with the GRL_METADATA_KEY_ part in the comment and broke.
Leave out the common key part in the comment to stop the script tripping.