controller: Update ovn-monitor-all documentation. #3402

Job	Run time
dpdk gcc	8s
linux rpm fedora	7m 4s
osx clang --disable-ssl	2m 1s
Prepare container	2m 19s
linux gcc --disable-ssl	2m 20s
linux clang --disable-ssl	2m 18s
linux gcc test -300	9m 5s
linux gcc test 301-600	6m 14s
linux gcc test 601- unstable	6m 35s
linux clang test sanitizers -300	12m 1s
linux clang test sanitizers 301-600	8m 57s
linux clang test sanitizers 601- unstable	9m 52s
linux gcc test -ljemalloc -300	9m 36s
linux gcc test -ljemalloc 301-600	6m 32s
linux gcc test -ljemalloc 601- unstable	6m 28s
linux gcc system-test-dpdk dpdk -100	15m 51s
linux gcc system-test-dpdk dpdk 101- unstable	11m 36s
linux gcc system-test-userspace -100	14m 51s
linux gcc system-test-userspace 101- unstable	10m 42s
linux gcc system-test -100	18m 1s
linux gcc system-test 101- unstable	14m 39s
linux clang system-test sanitizers -100	19m 25s
linux clang system-test sanitizers 101- unstable	17m 14s
linux x86 gcc --disable-ssl	2m 16s
	3h 36m 5s

Provide feedback