Allow LR to send RAs through localnet port. #4782

Job	Run time
linux rpm fedora	7m 17s
Prepare container	3m 18s
osx clang --disable-ssl	1m 58s
linux gcc --disable-ssl	2m 37s
linux clang --disable-ssl	2m 47s
linux gcc test -300	9m 43s
linux gcc test 301-600	6m 43s
linux gcc test 601- unstable	7m 24s
linux clang test sanitizers -300	13m 15s
linux clang test sanitizers 301-600	9m 28s
linux clang test sanitizers 601- unstable	12m 13s
linux gcc test -ljemalloc -300	10m 19s
linux gcc test -ljemalloc 301-600	6m 53s
linux gcc test -ljemalloc 601- unstable	8m 2s
linux gcc system-test-dpdk dpdk -100	16m 41s
linux gcc system-test-dpdk dpdk 101- unstable	15m 2s
linux gcc system-test-userspace -100	16m 3s
linux gcc system-test-userspace 101- unstable	13m 55s
linux gcc system-test -100	18m 44s
linux gcc system-test 101- unstable	18m 7s
linux clang system-test sanitizers -100	20m 24s
linux clang system-test sanitizers 101- unstable	20m 7s
linux x86 gcc --disable-ssl	2m 43s
	4h 3m 43s

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