tests: Wait for controller exit before restart. #3248

Job	Run time
Prepare container	3m 36s
linux rpm fedora	7m 15s
osx clang --disable-ssl	2m 24s
linux gcc --disable-ssl	2m 37s
linux clang --disable-ssl	2m 35s
linux gcc test -300	9m 27s
linux gcc test 301-600	6m 21s
linux gcc test 601- unstable	6m 36s
linux clang test sanitizers -300	12m 53s
linux clang test sanitizers 301-600	8m 51s
linux clang test sanitizers 601- unstable	10m 36s
linux gcc test -ljemalloc -300	9m 42s
linux gcc test -ljemalloc 301-600	6m 34s
linux gcc test -ljemalloc 601- unstable	6m 35s
linux gcc system-test-dpdk dpdk -100	16m 39s
linux gcc system-test-dpdk dpdk 101- unstable	14m 9s
linux gcc system-test-userspace -100	15m 56s
linux gcc system-test-userspace 101- unstable	12m 57s
linux gcc system-test -100	18m 19s
linux gcc system-test 101- unstable	16m 42s
linux clang system-test sanitizers -100	20m 28s
linux clang system-test sanitizers 101- unstable	18m 43s
linux x86 gcc --disable-ssl	2m 38s
	3h 52m 33s

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