tunnel: Do not carry source port from a previous tunnel. #1967

Job	Run time
osx clang --disable-ssl	3m 57s
osx clang --disable-ssl	3m 57s
dpdk gcc	6s
dpdk gcc	6s
linux deb no dpdk	6m 58s
linux deb no dpdk	6m 58s
linux gcc --disable-ssl	2m 10s
linux gcc --disable-ssl	2m 10s
linux clang --disable-ssl	2m 4s
linux clang --disable-ssl	2m 4s
linux gcc c99	2m 0s
linux gcc c99	2m 0s
linux clang c99	2m 4s
linux clang c99	2m 4s
linux gcc test	6m 44s
linux gcc test	6m 44s
linux clang test asan	10m 29s
linux clang test asan	10m 29s
linux clang test ubsan	6m 56s
linux clang test ubsan	6m 56s
linux gcc test --enable-shared	8m 35s
linux gcc test --enable-shared	8m 35s
linux clang test --enable-shared	8m 22s
linux clang test --enable-shared	8m 22s
linux gcc test dpdk	6m 53s
linux gcc test dpdk	6m 53s
linux clang test dpdk	6m 43s
linux clang test dpdk	6m 43s
linux gcc test -ljemalloc	6m 37s
linux gcc test -ljemalloc	6m 37s
linux clang test -ljemalloc	6m 31s
linux clang test -ljemalloc	6m 31s
linux gcc --enable-afxdp	2m 1s
linux gcc --enable-afxdp	2m 1s
linux clang --enable-afxdp	2m 7s
linux clang --enable-afxdp	2m 7s
linux gcc dpdk --enable-shared	2m 58s
linux gcc dpdk --enable-shared	2m 58s
linux clang dpdk --enable-shared	3m 4s
linux clang dpdk --enable-shared	3m 4s
linux gcc dpdk-shared	2m 13s
linux gcc dpdk-shared	2m 13s
linux clang dpdk-shared	2m 15s
linux clang dpdk-shared	2m 15s
linux gcc dpdk-shared --enable-shared	2m 58s
linux gcc dpdk-shared --enable-shared	2m 58s
linux clang dpdk-shared --enable-shared	2m 39s
linux clang dpdk-shared --enable-shared	2m 39s
linux gcc m32 --disable-ssl	53s
linux gcc m32 --disable-ssl	2m 4s
	3h 37m 45s

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