system-dpdk: Rework cleanup for vhost-user client tests. #547

Job	Run time
linux rpm fedora	11m 54s
linux deb no dpdk	4m 48s
osx clang --disable-ssl	3m 39s
dpdk gcc	5s
linux gcc --disable-ssl	2m 15s
linux clang --disable-ssl	2m 7s
linux gcc c99	2m 6s
linux clang c99	2m 5s
linux gcc test	6m 44s
linux clang test asan	10m 44s
linux clang test ubsan	7m 26s
linux gcc test --enable-shared	8m 45s
linux clang test --enable-shared	8m 40s
linux gcc check check-dpdk dpdk	7m 30s
linux clang check check-dpdk dpdk	6m 59s
linux gcc test -ljemalloc	6m 42s
linux clang test -ljemalloc	6m 42s
linux gcc --enable-afxdp	2m 7s
linux clang --enable-afxdp	2m 2s
linux gcc dpdk --enable-shared	3m 1s
linux clang dpdk --enable-shared	2m 50s
linux gcc dpdk-shared	2m 27s
linux clang dpdk-shared	2m 20s
linux gcc dpdk-shared --enable-shared	2m 57s
linux clang dpdk-shared --enable-shared	2m 55s
linux gcc m32 --disable-ssl	2m 11s
	2h 2m 1s

Provide feedback