controller: Omit alert for FDB and MAC binding timestamp. #3372

Job	Run time
Prepare container	1m 20s
linux rpm fedora	7m 18s
osx clang --disable-ssl	2m 5s
linux gcc --disable-ssl	2m 42s
linux clang --disable-ssl	2m 36s
linux gcc test -300	10m 0s
linux gcc test 301-600	7m 19s
linux gcc test 601- unstable	7m 11s
linux clang test sanitizers -300	13m 24s
linux clang test sanitizers 301-600	10m 26s
linux clang test sanitizers 601- unstable	12m 30s
linux gcc test -ljemalloc -300	10m 4s
linux gcc test -ljemalloc 301-600	7m 38s
linux gcc test -ljemalloc 601- unstable	7m 27s
linux gcc system-test-dpdk dpdk -100	16m 47s
linux gcc system-test-dpdk dpdk 101- unstable	16m 1s
linux gcc system-test-userspace -100	15m 45s
linux gcc system-test-userspace 101- unstable	14m 59s
linux gcc system-test -100	18m 19s
linux gcc system-test 101- unstable	19m 21s
linux clang system-test sanitizers -100	20m 45s
linux clang system-test sanitizers 101- unstable	21m 22s
linux x86 gcc --disable-ssl	2m 30s
	4h 7m 49s

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