northd: add router broadcast option to logical switch #179

Job	Run time
osx clang --disable-ssl	2m 0s
linux gcc --disable-ssl	2m 19s
linux clang --disable-ssl	2m 31s
linux gcc test -500	12m 2s
linux gcc test 501-1000	8m 1s
linux gcc test 1001-	5m 9s
linux clang test sanitizers -300	9m 58s
linux clang test sanitizers 301-600	11m 49s
linux clang test sanitizers 601-900	7m 17s
linux clang test sanitizers 901-1200	7m 37s
linux clang test sanitizers 1201-	5m 5s
linux gcc test -ljemalloc -500	13m 0s
linux gcc test -ljemalloc 501-1000	8m 11s
linux gcc test -ljemalloc 1001-	4m 56s
linux clang test -ljemalloc -500	13m 20s
linux clang test -ljemalloc 501-1000	8m 29s
linux clang test -ljemalloc 1001-	5m 23s
linux gcc system-test -100	10m 43s
linux gcc system-test 101-200	16m 12s
linux gcc system-test 201-	16m 21s
linux clang system-test sanitizers -100	12m 10s
linux clang system-test sanitizers 101-200	17m 16s
linux clang system-test sanitizers 201-	17m 27s
linux gcc m32 --disable-ssl	2m 19s
	3h 39m 35s

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