Add dynamic network interface determination for efa nodegroups #529

Job	Run time
build-image	11m 24s
build-image-neuron-inference	4m 30s
build	2m 52s
build-image-neuron-training	6m 36s
build-image-neuronx	14m 9s
build-image-nvidia	5m 7s
build-image-nvidia-inference	6m 45s
build-image-nvidia-training	9m 43s
build-test	1m 25s
	1h 2m 31s

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