ofproto-dpif: Fix removal of renamed datapath ports. #2187

Job	Run time
linux rpm fedora	8m 13s
linux deb no dpdk	10m 7s
osx clang --disable-ssl	4m 3s
dpdk gcc	7s
linux gcc --disable-ssl	3m 17s
linux clang --disable-ssl	3m 50s
linux gcc test	14m 39s
linux clang test asan	21m 57s
linux clang test ubsan	11m 38s
linux gcc test --enable-shared	18m 37s
linux clang test --enable-shared	16m 45s
linux gcc test dpdk	13m 24s
linux clang test dpdk	10m 33s
linux gcc test -ljemalloc	14m 28s
linux clang test -ljemalloc	12m 53s
linux gcc --enable-afxdp	4m 44s
linux clang --enable-afxdp	4m 1s
linux gcc dpdk --enable-shared	4m 50s
linux clang dpdk --enable-shared	4m 20s
linux gcc dpdk-shared	4m 36s
linux clang dpdk-shared	3m 26s
linux gcc dpdk-shared --enable-shared	5m 49s
linux clang dpdk-shared --enable-shared	6m 47s
linux gcc m32 --disable-ssl	5m 52s
	3h 28m 56s

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