ofproto-dpif: Fix removal of renamed datapath ports. #2171

Job	Run time
osx clang --disable-ssl	10m 51s
dpdk gcc	6s
linux rpm fedora	6m 10s
linux deb no dpdk	10m 9s
linux gcc --disable-ssl	4m 2s
linux clang --disable-ssl	3m 17s
linux gcc test	12m 2s
linux clang test asan	22m 31s
linux clang test ubsan	15m 36s
linux gcc test --enable-shared	18m 8s
linux clang test --enable-shared	15m 37s
linux gcc test dpdk	14m 8s
linux clang test dpdk	10m 48s
linux gcc test -ljemalloc	11m 5s
linux clang test -ljemalloc	10m 59s
linux gcc --enable-afxdp	3m 52s
linux clang --enable-afxdp	3m 23s
linux gcc dpdk --enable-shared	5m 57s
linux clang dpdk --enable-shared	5m 49s
linux gcc dpdk-shared	3m 40s
linux clang dpdk-shared	4m 49s
linux gcc dpdk-shared --enable-shared	6m 48s
linux clang dpdk-shared --enable-shared	4m 29s
linux gcc m32 --disable-ssl	3m 21s
	3h 27m 37s

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