ovn-controller: Fix busy loop when ofctrl is disconnected. #212

Job	Run time
dpdk gcc	1m 20s
osx clang --disable-ssl	3m 58s
linux rpm fedora	6m 54s
Prepare container	2m 23s
linux gcc --disable-ssl	2m 24s
linux clang --disable-ssl	2m 20s
linux gcc test -300	8m 49s
linux gcc test 301-600	5m 55s
linux gcc test 601- unstable	5m 34s
linux clang test sanitizers -300	11m 50s
linux clang test sanitizers 301-600	8m 33s
linux clang test sanitizers 601- unstable	9m 17s
linux gcc test -ljemalloc -300	9m 15s
linux gcc test -ljemalloc 301-600	6m 6s
linux gcc test -ljemalloc 601- unstable	5m 52s
linux gcc system-test-dpdk dpdk -100	15m 49s
linux gcc system-test-dpdk dpdk 101- unstable	12m 50s
linux gcc system-test-userspace -100	14m 38s
linux gcc system-test-userspace 101- unstable	11m 49s
linux gcc system-test -100	17m 11s
linux gcc system-test 101- unstable	13m 8s
linux clang system-test sanitizers -100	18m 55s
linux clang system-test sanitizers 101- unstable	14m 49s
linux x86 gcc --disable-ssl	2m 17s
	3h 31m 56s

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