hydra-eval-jobs: Parallelize

(cherry picked from commit be8eb9d00d6a3fcac520bc7dfd5740c0b3ade746)

Created by  Eelco Dolstra  on February 19, 2020
XJISJGZLGWLCTN6EZWVVHKQFCDVCSXTNYL7YE2UB74AOA2XGYOCAC
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