netdev_offload_dpdk: Support QinQ offload. #6577

Job	Run time
libreswan (ubuntu-24.04)	8s
linux rpm fedora	4m 10s
dpdk gcc (ubuntu-24.04)	10s
linux deb no dpdk	7m 26s
build oss-fuzz fuzzers	2m 55s
osx clang --disable-ssl	1m 32s
linux gcc --disable-ssl	2m 51s
linux clang --disable-ssl	2m 36s
linux gcc c99	3m 36s
clang-analyze	21m 11s
linux clang c99	2m 33s
linux gcc test	8m 38s
linux clang address,undefined test	17m 49s
linux gcc test --enable-shared	11m 34s
linux clang test --enable-shared	11m 5s
linux gcc check check-dpdk dpdk	17m 16s
linux clang check check-dpdk dpdk	17m 34s
linux gcc test -ljemalloc	9m 6s
linux clang test -ljemalloc	10m 6s
linux gcc --enable-afxdp	2m 50s
linux clang --enable-afxdp	4m 8s
linux gcc dpdk --enable-shared	4m 4s
linux clang dpdk --enable-shared	3m 52s
linux gcc dpdk-shared	3m 7s
linux clang dpdk-shared	3m 8s
linux gcc dpdk-shared --enable-shared	3m 58s
linux clang dpdk-shared --enable-shared	4m 49s
linux gcc m32 --disable-ssl	3m 1s
linux gcc check-ovsdb-cluster	7m 4s
linux gcc check-kernel -100	10m 22s
linux gcc check-kernel 100-	15m 24s
linux clang address,undefined check-kernel -100	12m 43s
linux clang address,undefined check-kernel 100-	18m 11s
linux gcc check-offloads -100	10m 40s
linux gcc check-offloads 100-	12m 24s
linux gcc dpdk check-system-userspace	11m 35s
linux clang address,undefined dpdk check-system-userspace	14m 25s
linux gcc dpdk check-system-tso	10m 23s
linux gcc dpdk check-afxdp	10m 56s
	5h 19m 20s

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