services.hydra -> services.hydra-dev

Since Nixpkgs 16.09 contains a Hydra module, we were getting a conflict. I guess we should have a way to override modules in Nixpkgs…

Created by  Eelco Dolstra  on October 10, 2016
CLL3LBCD37ULWL4E5BXTPKJVEP72TL4XNK762LMZROIIKZCV473AC
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