Allow LR to send RAs through localnet port. #4791

Job	Run time
linux rpm fedora	7m 51s
dpdk gcc	1m 30s
osx clang --disable-ssl	2m 15s
Prepare container	2m 8s
linux gcc --disable-ssl	2m 15s
linux clang --disable-ssl	2m 32s
linux gcc test -300	9m 27s
linux gcc test 301-600	5m 43s
linux gcc test 601- unstable	6m 0s
linux clang test sanitizers -300	12m 11s
linux clang test sanitizers 301-600	8m 4s
linux clang test sanitizers 601- unstable	9m 48s
linux gcc test -ljemalloc -300	9m 29s
linux gcc test -ljemalloc 301-600	5m 50s
linux gcc test -ljemalloc 601- unstable	6m 21s
linux gcc system-test-dpdk dpdk -100	16m 11s
linux gcc system-test-dpdk dpdk 101- unstable	11m 11s
linux gcc system-test-userspace -100	14m 59s
linux gcc system-test-userspace 101- unstable	10m 11s
linux gcc system-test -100	17m 50s
linux gcc system-test 101- unstable	14m 5s
linux clang system-test sanitizers -100	19m 37s
linux clang system-test sanitizers 101- unstable	15m 40s
linux x86 gcc --disable-ssl	2m 13s
	3h 33m 21s

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