northd: del l2 lookup table entry for disabled lsp #4702

Job	Run time
linux rpm fedora	6m 57s
osx clang --disable-ssl	1m 51s
Prepare container	3m 36s
linux gcc --disable-ssl	2m 39s
linux clang --disable-ssl	2m 49s
linux gcc test -300	9m 24s
linux gcc test 301-600	6m 32s
linux gcc test 601- unstable	6m 40s
linux clang test sanitizers -300	12m 43s
linux clang test sanitizers 301-600	9m 7s
linux clang test sanitizers 601- unstable	11m 27s
linux gcc test -ljemalloc -300	9m 56s
linux gcc test -ljemalloc 301-600	6m 42s
linux gcc test -ljemalloc 601- unstable	7m 0s
linux gcc system-test-dpdk dpdk -100	17m 1s
linux gcc system-test-dpdk dpdk 101- unstable	14m 43s
linux gcc system-test-userspace -100	16m 18s
linux gcc system-test-userspace 101- unstable	13m 18s
linux gcc system-test -100	18m 27s
linux gcc system-test 101- unstable	17m 36s
linux clang system-test sanitizers -100	20m 18s
linux clang system-test sanitizers 101- unstable	19m 31s
linux x86 gcc --disable-ssl	2m 38s
	3h 57m 13s

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