Remove CI for vagrant #531

Job	Run time
build (gcc, vanilla)	7m 54s
build (gcc, dpdk)	14m 32s
build (gcc, dpdk-light)	16m 10s
build (gcc, netmap)	7m 33s
build (gcc, vanilla-nopool)	7m 42s
build (gcc, dpdk-flow-dynamic)	14m 29s
build (clang, vanilla)	10m 29s
build (clang, dpdk)	16m 30s
build (clang, dpdk-light)	18m 24s
build (clang, netmap)	10m 38s
build (clang, vanilla-nopool)	10m 31s
build (clang, dpdk-flow-dynamic)	16m 31s
	2h 31m 23s

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