hydra-eval-jobs: Support meta.license being a list

TODO: PostgreSQL has an array column type, we should use it for the license and maintainers columns.

Created by  Eelco Dolstra  on November 4, 2013
DPYJFBXU55M7PFYHARO5FSZ4GFNZQQI4GYV5YTIXC77FUCVUU3PAC
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