Add dynamic network interface determination for efa nodegroups #530

Job	Run time
build-image-neuron-training	6m 49s
build-image-neuron-inference	4m 59s
build	2m 52s
build-image	11m 20s
build-image-neuronx	14m 4s
build-image-nvidia	5m 8s
build-image-nvidia-inference	7m 0s
build-image-nvidia-training	9m 31s
build-test	1m 15s
	1h 2m 58s

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