ovn-macros: Make sure stopped daemons continue before the test ends. #2501

Job	Run time
linux rpm fedora	7m 8s
linux gcc --disable-ssl	1m 52s
osx clang --disable-ssl	5m 20s
linux clang --disable-ssl	1m 57s
linux gcc test -500	13m 33s
linux gcc test 501-1000	9m 3s
linux gcc test 1001-	4m 16s
linux clang test sanitizers -300	10m 54s
linux clang test sanitizers 301-600	14m 10s
linux clang test sanitizers 601-900	8m 18s
linux clang test sanitizers 901-1200	6m 18s
linux clang test sanitizers 1201-	5m 33s
linux gcc test -ljemalloc -500	15m 28s
linux gcc test -ljemalloc 501-1000	9m 37s
linux gcc test -ljemalloc 1001-	4m 33s
linux gcc system-test-userspace -100	9m 31s
linux gcc system-test-userspace 101-200	13m 46s
linux gcc system-test-userspace 201-	17m 39s
linux gcc system-test -100	12m 44s
linux gcc system-test 101-200	15m 12s
linux gcc system-test 201-	22m 39s
linux clang system-test sanitizers -100	14m 27s
linux clang system-test sanitizers 101-200	17m 14s
linux clang system-test sanitizers 201-	24m 42s
linux x86 gcc --disable-ssl	1m 53s
	4h 27m 47s

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