controller: Optimize adding 'dps' to the local datapaths. #1023

Job	Run time
Prepare container	3m 15s
osx clang --disable-ssl	2m 6s
linux rpm fedora	6m 50s
linux gcc --disable-ssl	2m 45s
linux clang --disable-ssl	2m 49s
linux gcc test -300	10m 18s
linux gcc test 301-600	7m 46s
linux gcc test 601- unstable	7m 56s
linux clang test sanitizers -300	13m 26s
linux clang test sanitizers 301-600	11m 8s
linux clang test sanitizers 601- unstable	12m 39s
linux gcc test -ljemalloc -300	10m 6s
linux gcc test -ljemalloc 301-600	8m 15s
linux gcc test -ljemalloc 601- unstable	7m 33s
linux gcc system-test-dpdk dpdk -100	17m 4s
linux gcc system-test-dpdk dpdk 101- unstable	15m 59s
linux gcc system-test-userspace -100	16m 4s
linux gcc system-test-userspace 101- unstable	14m 51s
linux gcc system-test -100	18m 9s
linux gcc system-test 101- unstable	19m 21s
linux clang system-test sanitizers -100	20m 21s
linux clang system-test sanitizers 101- unstable	21m 34s
linux x86 gcc --disable-ssl	2m 47s
	4h 13m 2s

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