en-advertised-route-sync: Don't assume that switch peers are routers. #3437

Job	Run time
osx clang --disable-ssl	2m 19s
linux rpm fedora	7m 17s
Prepare container	1m 0s
linux gcc --disable-ssl	2m 38s
linux clang --disable-ssl	2m 42s
linux gcc test -300	9m 47s
linux gcc test 301-600	7m 35s
linux gcc test 601- unstable	7m 48s
linux clang test sanitizers -300	13m 18s
linux clang test sanitizers 301-600	10m 9s
linux clang test sanitizers 601- unstable	12m 25s
linux gcc test -ljemalloc -300	10m 9s
linux gcc test -ljemalloc 301-600	7m 32s
linux gcc test -ljemalloc 601- unstable	7m 43s
linux gcc system-test-dpdk dpdk -100	16m 57s
linux gcc system-test-dpdk dpdk 101- unstable	16m 46s
linux gcc system-test-userspace -100	15m 50s
linux gcc system-test-userspace 101- unstable	16m 9s
linux gcc system-test -100	20m 31s
linux gcc system-test 101- unstable	24m 49s
linux clang system-test sanitizers -100	22m 48s
linux clang system-test sanitizers 101- unstable	27m 6s
linux x86 gcc --disable-ssl	2m 41s
	4h 25m 59s

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