ovs: Bump submodule to branch-3.4. #181

Job	Run time
osx clang --disable-ssl	2m 2s
Prepare container	3m 28s
linux rpm fedora	7m 7s
linux gcc --disable-ssl	2m 39s
linux clang --disable-ssl	2m 31s
linux gcc test -300	9m 11s
linux gcc test 301-600	6m 10s
linux gcc test 601- unstable	7m 7s
linux clang test sanitizers -300	12m 22s
linux clang test sanitizers 301-600	8m 40s
linux clang test sanitizers 601- unstable	10m 31s
linux gcc test -ljemalloc -300	9m 24s
linux gcc test -ljemalloc 301-600	6m 13s
linux gcc test -ljemalloc 601- unstable	6m 29s
linux gcc system-test-dpdk dpdk -100	16m 45s
linux gcc system-test-dpdk dpdk 101- unstable	12m 4s
linux gcc system-test-userspace -100	15m 19s
linux gcc system-test-userspace 101- unstable	10m 58s
linux gcc system-test -100	17m 58s
linux gcc system-test 101- unstable	14m 27s
linux clang system-test sanitizers -100	19m 48s
linux clang system-test sanitizers 101- unstable	16m 10s
linux x86 gcc --disable-ssl	2m 37s
	3h 40m 0s

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