northd: Trigger a full recompute if add-route option is toggled. #3325

Job	Run time
osx clang --disable-ssl	2m 19s
Prepare container	3m 28s
linux rpm fedora	6m 43s
linux gcc --disable-ssl	2m 36s
linux clang --disable-ssl	2m 46s
linux gcc test -300	9m 17s
linux gcc test 301-600	6m 32s
linux gcc test 601- unstable	6m 11s
linux clang test sanitizers -300	12m 49s
linux clang test sanitizers 301-600	8m 57s
linux clang test sanitizers 601- unstable	10m 40s
linux gcc test -ljemalloc -300	10m 0s
linux gcc test -ljemalloc 301-600	6m 29s
linux gcc test -ljemalloc 601- unstable	6m 29s
linux gcc system-test-dpdk dpdk -100	16m 46s
linux gcc system-test-dpdk dpdk 101- unstable	14m 28s
linux gcc system-test-userspace -100	15m 48s
linux gcc system-test-userspace 101- unstable	13m 3s
linux gcc system-test -100	18m 25s
linux gcc system-test 101- unstable	17m 34s
linux clang system-test sanitizers -100	20m 17s
linux clang system-test sanitizers 101- unstable	19m 37s
linux x86 gcc --disable-ssl	2m 33s
	3h 53m 47s

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