ovs: Bump submodule to latest OVS branch-3.4. #891

Job	Run time
linux rpm fedora	6m 45s
osx clang --disable-ssl	1m 56s
Prepare container	1m 0s
linux gcc --disable-ssl	2m 36s
linux clang --disable-ssl	2m 48s
linux gcc test -300	9m 32s
linux gcc test 301-600	6m 12s
linux gcc test 601- unstable	6m 30s
linux clang test sanitizers -300	12m 26s
linux clang test sanitizers 301-600	8m 55s
linux clang test sanitizers 601- unstable	10m 43s
linux gcc test -ljemalloc -300	9m 45s
linux gcc test -ljemalloc 301-600	6m 35s
linux gcc test -ljemalloc 601- unstable	6m 33s
linux gcc system-test-dpdk dpdk -100	17m 6s
linux gcc system-test-dpdk dpdk 101- unstable	14m 7s
linux gcc system-test-userspace -100	16m 0s
linux gcc system-test-userspace 101- unstable	12m 58s
linux gcc system-test -100	18m 30s
linux gcc system-test 101- unstable	16m 38s
linux clang system-test sanitizers -100	20m 6s
linux clang system-test sanitizers 101- unstable	18m 33s
linux x86 gcc --disable-ssl	2m 33s
	3h 48m 47s

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