mcast-snooping: Flush flood and report ports when deleting interfaces. #1943

Job	Run time
dpdk gcc	2m 9s
linux deb no dpdk	6m 20s
osx clang --disable-ssl	3m 19s
linux gcc --disable-ssl	2m 10s
linux clang --disable-ssl	2m 10s
linux gcc c99	2m 34s
linux clang c99	2m 1s
linux gcc test	6m 17s
linux clang test asan	10m 37s
linux clang test ubsan	7m 18s
linux gcc test --enable-shared	8m 30s
linux clang test --enable-shared	8m 25s
linux gcc test dpdk	6m 30s
linux clang test dpdk	6m 21s
linux gcc test -ljemalloc	6m 32s
linux clang test -ljemalloc	6m 21s
linux gcc --enable-afxdp	2m 7s
linux clang --enable-afxdp	2m 6s
linux gcc dpdk --enable-shared	3m 4s
linux clang dpdk --enable-shared	2m 50s
linux gcc dpdk-shared	2m 17s
linux clang dpdk-shared	2m 9s
linux gcc dpdk-shared --enable-shared	3m 9s
linux clang dpdk-shared --enable-shared	2m 52s
linux gcc m32 --disable-ssl	2m 16s
	1h 50m 24s

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