northd: Trigger a full recompute if add-route option is toggled. #3324

Job	Run time
linux rpm fedora	6m 41s
osx clang --disable-ssl	2m 21s
Prepare container	1m 9s
linux gcc --disable-ssl	2m 46s
linux clang --disable-ssl	2m 36s
linux gcc test -300	9m 45s
linux gcc test 301-600	6m 57s
linux gcc test 601- unstable	7m 5s
linux clang test sanitizers -300	13m 15s
linux clang test sanitizers 301-600	9m 32s
linux clang test sanitizers 601- unstable	12m 1s
linux gcc test -ljemalloc -300	10m 16s
linux gcc test -ljemalloc 301-600	6m 48s
linux gcc test -ljemalloc 601- unstable	7m 20s
linux gcc system-test-dpdk dpdk -100	17m 2s
linux gcc system-test-dpdk dpdk 101- unstable	15m 0s
linux gcc system-test-userspace -100	15m 46s
linux gcc system-test-userspace 101- unstable	14m 3s
linux gcc system-test -100	18m 26s
linux gcc system-test 101- unstable	18m 18s
linux clang system-test sanitizers -100	20m 34s
linux clang system-test sanitizers 101- unstable	20m 24s
linux x86 gcc --disable-ssl	2m 33s
	4h 0m 38s

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