Fixes for 64-bit rates #590

Job	Run time
build (gcc, vanilla)	7m 43s
build (gcc, dpdk)	8m 53s
build (gcc, dpdk-light)	10m 58s
build (gcc, netmap)	7m 53s
build (gcc, vanilla-nopool)	7m 56s
build (gcc, dpdk-flow-dynamic)	9m 36s
build (clang, vanilla)	10m 49s
build (clang, dpdk)	11m 51s
build (clang, dpdk-light)	13m 51s
build (clang, netmap)	10m 47s
build (clang, vanilla-nopool)	10m 35s
build (clang, dpdk-flow-dynamic)	12m 11s
mirror	38s
	2h 3m 41s

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