AllenConfig: better support for 2-GPUs and 1-GPU architectures

Tommaso Colomborequested to merge
tcolombo-allen_2_gpus into master

Before this change, all Allen instances on a machine would connect to all available input buffers. When only one Allen instance is running, this is the desired behavior. When 2 (or more) instances are running, however, each instance should connect to a single input buffer.

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