controller: Update ovn-monitor-all documentation. #3400

Job	Run time
linux rpm fedora	7m 9s
Prepare container	54s
osx clang --disable-ssl	1m 55s
linux gcc --disable-ssl	2m 37s
linux clang --disable-ssl	2m 43s
linux gcc test -300	10m 29s
linux gcc test 301-600	7m 35s
linux gcc test 601- unstable	7m 27s
linux clang test sanitizers -300	13m 27s
linux clang test sanitizers 301-600	9m 51s
linux clang test sanitizers 601- unstable	13m 0s
linux gcc test -ljemalloc -300	10m 24s
linux gcc test -ljemalloc 301-600	7m 40s
linux gcc test -ljemalloc 601- unstable	7m 50s
linux gcc system-test-dpdk dpdk -100	17m 8s
linux gcc system-test-dpdk dpdk 101- unstable	17m 19s
linux gcc system-test-userspace -100	16m 7s
linux gcc system-test-userspace 101- unstable	16m 5s
linux gcc system-test -100	18m 44s
linux gcc system-test 101- unstable	21m 14s
linux clang system-test sanitizers -100	20m 36s
linux clang system-test sanitizers 101- unstable	23m 31s
linux x86 gcc --disable-ssl	2m 35s
	4h 16m 20s

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