Allow Hydra's binary cache to be signed

This requires adding the following to hydra.conf:

binary_cache_key_name = <key-name> binary_cache_private_key_file = <path-to-private-key>

e.g.

binary_cache_key_name = hydra.nixos.org-1 binary_cache_private_key_file = /home/hydra/cache-key.sec

Created by  Eelco Dolstra  on January 8, 2014
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