system-common-macros: Fix conntrack matching. #567

Job	Run time
osx clang --disable-ssl	3m 20s
linux deb no dpdk	5m 41s
linux rpm fedora	4m 29s
dpdk gcc	11s
clang-analyze	10m 4s
linux gcc --disable-ssl	2m 22s
linux clang --disable-ssl	2m 33s
linux gcc c99	2m 12s
linux clang c99	2m 31s
linux gcc test	7m 52s
linux clang address,undefined test	16m 3s
linux gcc test --enable-shared	11m 39s
linux clang test --enable-shared	11m 23s
linux gcc check check-dpdk dpdk	17m 14s
linux clang check check-dpdk dpdk	16m 59s
linux gcc test -ljemalloc	8m 32s
linux clang test -ljemalloc	8m 34s
linux gcc --enable-afxdp	2m 31s
linux clang --enable-afxdp	2m 31s
linux gcc dpdk --enable-shared	3m 49s
linux clang dpdk --enable-shared	3m 36s
linux gcc dpdk-shared	2m 34s
linux clang dpdk-shared	2m 36s
linux gcc dpdk-shared --enable-shared	3m 23s
linux clang dpdk-shared --enable-shared	3m 34s
linux gcc m32 --disable-ssl	2m 31s
linux gcc check-ovsdb-cluster	6m 10s
linux gcc check-kernel -100	9m 7s
linux gcc check-kernel 100-	9m 28s
linux clang address,undefined check-kernel -100	10m 58s
linux clang address,undefined check-kernel 100-	11m 13s
linux gcc check-offloads -100	8m 58s
linux gcc check-offloads 100-	7m 8s
linux gcc dpdk check-system-userspace	10m 39s
linux clang address,undefined dpdk check-system-userspace	14m 4s
linux gcc dpdk check-system-tso	10m 29s
linux gcc dpdk check-afxdp	10m 57s
	4h 27m 55s

Provide feedback