add unixctl to ovn-controller #2560

Job	Run time
osx clang --disable-ssl	5m 10s
dpdk gcc	7s
linux rpm fedora	6m 31s
linux gcc --disable-ssl	1m 54s
linux clang --disable-ssl	2m 0s
linux gcc test -300	8m 28s
linux gcc test 301-600	5m 32s
linux gcc test 601- unstable	4m 56s
linux clang test sanitizers -300	11m 24s
linux clang test sanitizers 301-600	8m 8s
linux clang test sanitizers 601- unstable	8m 46s
linux gcc test -ljemalloc -300	8m 40s
linux gcc test -ljemalloc 301-600	5m 41s
linux gcc test -ljemalloc 601- unstable	5m 9s
linux gcc system-test-dpdk dpdk -100	12m 40s
linux gcc system-test-dpdk dpdk 101- unstable	12m 6s
linux gcc system-test-userspace -100	11m 29s
linux gcc system-test-userspace 101- unstable	10m 59s
linux gcc system-test -100	14m 1s
linux gcc system-test 101- unstable	12m 30s
linux clang system-test sanitizers -100	15m 48s
linux clang system-test sanitizers 101- unstable	14m 9s
linux x86 gcc --disable-ssl	1m 49s
	3h 7m 57s

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