Allow LR to send RAs through localnet port. #4748

Job	Run time
osx clang --disable-ssl	1m 56s
Prepare container	3m 17s
linux rpm fedora	6m 53s
linux gcc --disable-ssl	2m 38s
linux clang --disable-ssl	2m 41s
linux gcc test -300	9m 36s
linux gcc test 301-600	6m 28s
linux gcc test 601- unstable	6m 45s
linux clang test sanitizers -300	12m 49s
linux clang test sanitizers 301-600	9m 6s
linux clang test sanitizers 601- unstable	12m 52s
linux gcc test -ljemalloc -300	9m 51s
linux gcc test -ljemalloc 301-600	6m 58s
linux gcc test -ljemalloc 601- unstable	7m 8s
linux gcc system-test-dpdk dpdk -100	16m 46s
linux gcc system-test-dpdk dpdk 101- unstable	14m 57s
linux gcc system-test-userspace -100	16m 5s
linux gcc system-test-userspace 101- unstable	13m 50s
linux gcc system-test -100	18m 15s
linux gcc system-test 101- unstable	18m 6s
linux clang system-test sanitizers -100	20m 35s
linux clang system-test sanitizers 101- unstable	20m 5s
linux x86 gcc --disable-ssl	2m 45s
	4h 0m 22s

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