Add EXPUnqueue #537

Job	Run time
build (gcc, vanilla)	7m 43s
build (gcc, dpdk)	8m 49s
build (gcc, dpdk-light)	10m 56s
build (gcc, netmap)	7m 59s
build (gcc, vanilla-nopool)	7m 42s
build (gcc, dpdk-flow-dynamic)	8m 56s
build (clang, vanilla)	10m 12s
build (clang, dpdk)	11m 26s
build (clang, dpdk-light)	13m 34s
build (clang, netmap)	10m 33s
build (clang, vanilla-nopool)	10m 19s
build (clang, dpdk-flow-dynamic)	11m 58s
	2h 0m 7s

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