ofproto-dpif: Fix removal of renamed datapath ports. #2186

Job	Run time
linux rpm fedora	6m 28s
osx clang --disable-ssl	4m 12s
dpdk gcc	7s
linux deb no dpdk	9m 24s
linux gcc --disable-ssl	3m 31s
linux clang --disable-ssl	3m 5s
linux gcc test	10m 38s
linux clang test asan	22m 23s
linux clang test ubsan	11m 33s
linux gcc test --enable-shared	14m 57s
linux clang test --enable-shared	15m 3s
linux gcc test dpdk	14m 41s
linux clang test dpdk	12m 43s
linux gcc test -ljemalloc	10m 37s
linux clang test -ljemalloc	12m 56s
linux gcc --enable-afxdp	4m 4s
linux clang --enable-afxdp	4m 1s
linux gcc dpdk --enable-shared	4m 40s
linux clang dpdk --enable-shared	4m 5s
linux gcc dpdk-shared	4m 30s
linux clang dpdk-shared	3m 26s
linux gcc dpdk-shared --enable-shared	5m 0s
linux clang dpdk-shared --enable-shared	4m 4s
linux gcc m32 --disable-ssl	3m 20s
	3h 9m 28s

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