system-dpdk: Wait for MTU changes to be applied. #1973

Job	Run time
osx clang --disable-ssl	4m 24s
linux rpm fedora	4m 34s
linux deb no dpdk	4m 21s
dpdk gcc	4s
linux gcc --disable-ssl	2m 6s
linux clang --disable-ssl	2m 7s
linux gcc c99	2m 6s
linux clang c99	3m 10s
linux gcc test	6m 45s
linux clang test asan	11m 4s
linux clang test ubsan	7m 34s
linux gcc test --enable-shared	8m 39s
linux clang test --enable-shared	8m 52s
linux gcc check check-dpdk dpdk	13m 40s
linux clang check check-dpdk dpdk	14m 22s
linux gcc test -ljemalloc	6m 42s
linux clang test -ljemalloc	7m 5s
linux gcc --enable-afxdp	2m 8s
linux clang --enable-afxdp	2m 18s
linux gcc dpdk --enable-shared	3m 4s
linux clang dpdk --enable-shared	3m 3s
linux gcc dpdk-shared	2m 14s
linux clang dpdk-shared	2m 23s
linux gcc dpdk-shared --enable-shared	3m 0s
linux clang dpdk-shared --enable-shared	2m 48s
linux gcc m32 --disable-ssl	2m 19s
	2h 10m 52s

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