ofproto-dpif-trace: Improve conjunctive match tracing. #2373

Job	Run time
dpdk gcc	7s
linux rpm fedora	4m 57s
osx clang --disable-ssl	4m 8s
linux deb no dpdk	4m 22s
linux gcc --disable-ssl	2m 8s
linux clang --disable-ssl	2m 1s
linux gcc c99	2m 11s
linux clang c99	2m 27s
linux gcc test	6m 27s
linux clang test asan	10m 47s
linux clang test ubsan	7m 13s
linux gcc test --enable-shared	8m 41s
linux clang test --enable-shared	8m 55s
linux gcc test dpdk	7m 35s
linux clang test dpdk	7m 37s
linux gcc test -ljemalloc	6m 49s
linux clang test -ljemalloc	6m 41s
linux gcc --enable-afxdp	2m 12s
linux clang --enable-afxdp	2m 9s
linux gcc dpdk --enable-shared	3m 8s
linux clang dpdk --enable-shared	2m 47s
linux gcc dpdk-shared	2m 24s
linux clang dpdk-shared	2m 12s
linux gcc dpdk-shared --enable-shared	3m 0s
linux clang dpdk-shared --enable-shared	2m 47s
linux gcc m32 --disable-ssl	2m 14s
	1h 55m 59s

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