[hack] Tweak Hack exit codes, and HHVM's interpretation of them
[hack] Tweak Hack exit codes, and HHVM's interpretation of them

Summary: D2194895 dramatically cleaned up the exit codes, but
accidentally inverted "timeout" and "out of retries". They should
probably both just be the same exit code. Also, since some recent
refactoring, HHVM doesn't need to look for this huge series of codes,
and can just care about that one.

Reviewed By: @int3

Differential Revision: D2264925

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