controller: Cleanup routes on stop. #4775

Job	Run time
Prepare container	3m 29s
linux rpm fedora	5m 28s
osx clang --disable-ssl	2m 0s
linux gcc --disable-ssl	2m 48s
linux clang --disable-ssl	3m 2s
linux gcc test -300	3m 0s
linux gcc test 301-600	3m 28s
linux gcc test 601- unstable	3m 24s
linux clang test sanitizers -300	4m 10s
linux clang test sanitizers 301-600	4m 25s
linux clang test sanitizers 601- unstable	4m 58s
linux gcc test -ljemalloc -300	3m 1s
linux gcc test -ljemalloc 301-600	3m 17s
linux gcc test -ljemalloc 601- unstable	3m 23s
linux gcc system-test-dpdk dpdk -100	3m 37s
linux gcc system-test-dpdk dpdk 101- unstable	3m 49s
linux gcc system-test-userspace -100	3m 0s
linux gcc system-test-userspace 101- unstable	2m 59s
linux gcc system-test -100	2m 53s
linux gcc system-test 101- unstable	2m 53s
linux clang system-test sanitizers -100	3m 47s
linux clang system-test sanitizers 101- unstable	3m 48s
linux x86 gcc --disable-ssl	3m 0s
	1h 19m 39s

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