tests: Implement send_garp using scapy. #4682

Job	Run time
osx clang --disable-ssl	2m 12s
Prepare container	3m 36s
linux rpm fedora	7m 6s
linux gcc --disable-ssl	2m 40s
linux clang --disable-ssl	2m 48s
linux gcc test -300	9m 28s
linux gcc test 301-600	6m 19s
linux gcc test 601- unstable	6m 33s
linux clang test sanitizers -300	12m 54s
linux clang test sanitizers 301-600	9m 25s
linux clang test sanitizers 601- unstable	11m 15s
linux gcc test -ljemalloc -300	10m 14s
linux gcc test -ljemalloc 301-600	6m 32s
linux gcc test -ljemalloc 601- unstable	6m 58s
linux gcc system-test-dpdk dpdk -100	17m 5s
linux gcc system-test-dpdk dpdk 101- unstable	14m 30s
linux gcc system-test-userspace -100	15m 53s
linux gcc system-test-userspace 101- unstable	13m 12s
linux gcc system-test -100	18m 23s
linux gcc system-test 101- unstable	17m 36s
linux clang system-test sanitizers -100	20m 18s
linux clang system-test sanitizers 101- unstable	19m 25s
linux x86 gcc --disable-ssl	2m 41s
	3h 57m 3s

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