controller: Optimize adding 'dps' to the local datapaths. #1032

Job	Run time
Prepare container	3m 51s
osx clang --disable-ssl	1m 53s
linux rpm fedora	7m 8s
linux gcc --disable-ssl	2m 35s
linux clang --disable-ssl	2m 49s
linux gcc test -300	10m 2s
linux gcc test 301-600	7m 33s
linux gcc test 601- unstable	7m 30s
linux clang test sanitizers -300	13m 19s
linux clang test sanitizers 301-600	10m 17s
linux clang test sanitizers 601- unstable	12m 40s
linux gcc test -ljemalloc -300	10m 31s
linux gcc test -ljemalloc 301-600	7m 39s
linux gcc test -ljemalloc 601- unstable	7m 50s
linux gcc system-test-dpdk dpdk -100	17m 2s
linux gcc system-test-dpdk dpdk 101- unstable	16m 36s
linux gcc system-test-userspace -100	15m 49s
linux gcc system-test-userspace 101- unstable	15m 27s
linux gcc system-test -100	18m 10s
linux gcc system-test 101- unstable	20m 20s
linux clang system-test sanitizers -100	20m 19s
linux clang system-test sanitizers 101- unstable	22m 1s
linux x86 gcc --disable-ssl	2m 36s
	4h 13m 57s

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