Support 64-bit bandwidths #549

Job	Run time
build (gcc, vanilla)	7m 43s
build (gcc, dpdk)	8m 2s
build (gcc, dpdk-light)	8m 4s
build (gcc, netmap)	7m 47s
build (gcc, vanilla-nopool)	7m 45s
build (gcc, dpdk-flow-dynamic)	8m 3s
build (clang, vanilla)	8m 2s
build (clang, dpdk)	8m 2s
build (clang, dpdk-light)	8m 3s
build (clang, netmap)	8m 2s
build (clang, vanilla-nopool)	8m 2s
build (clang, dpdk-flow-dynamic)	8m 2s
	1h 35m 37s

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