tests: Wait for controller exit before restart. #3247

Job	Run time
linux rpm fedora	6m 51s
Prepare container	1m 15s
osx clang --disable-ssl	1m 57s
linux gcc --disable-ssl	2m 46s
linux clang --disable-ssl	2m 38s
linux gcc test -300	9m 14s
linux gcc test 301-600	6m 19s
linux gcc test 601- unstable	6m 37s
linux clang test sanitizers -300	12m 37s
linux clang test sanitizers 301-600	9m 3s
linux clang test sanitizers 601- unstable	11m 50s
linux gcc test -ljemalloc -300	10m 1s
linux gcc test -ljemalloc 301-600	6m 27s
linux gcc test -ljemalloc 601- unstable	6m 39s
linux gcc system-test-dpdk dpdk -100	16m 53s
linux gcc system-test-dpdk dpdk 101- unstable	14m 26s
linux gcc system-test-userspace -100	15m 49s
linux gcc system-test-userspace 101- unstable	13m 11s
linux gcc system-test -100	18m 18s
linux gcc system-test 101- unstable	16m 50s
linux clang system-test sanitizers -100	20m 4s
linux clang system-test sanitizers 101- unstable	18m 35s
linux x86 gcc --disable-ssl	2m 35s
	3h 50m 55s

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