Add a warning message when BWRatedUnqueue has no BURST #602

Job	Run time
build (gcc, vanilla)	8m 0s
build (gcc, dpdk)	9m 10s
build (gcc, dpdk-light)	11m 4s
build (gcc, netmap)	8m 5s
build (gcc, vanilla-nopool)	7m 37s
build (gcc, dpdk-flow-dynamic)	8m 57s
build (clang, vanilla)	10m 43s
build (clang, dpdk)	12m 4s
build (clang, dpdk-light)	14m 26s
build (clang, netmap)	11m 20s
build (clang, vanilla-nopool)	10m 47s
build (clang, dpdk-flow-dynamic)	11m 50s
mirror	4m 51s
	2h 8m 54s

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