Try harder to find build logs

Due to the fixed-output derivation hashing scheme, there can be multiple derivations of the same output path. But build logs are indexed by derivation path. Thus, we may not be able to find the log of a build or build step using its derivation. So as a fallback, Hydra now looks for other derivations with the same output paths.

Created by  Eelco Dolstra  on August 30, 2013
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