dpif-netdev: Add per PMD sleep config. #5345

Job	Run time
dpdk gcc	9s
linux rpm fedora	5m 7s
osx clang --disable-ssl	3m 5s
linux deb no dpdk	7m 41s
linux gcc --disable-ssl	2m 32s
linux clang --disable-ssl	2m 8s
linux gcc c99	2m 16s
linux clang c99	2m 8s
linux gcc test	6m 42s
linux clang test asan	10m 35s
linux clang test ubsan	7m 10s
linux gcc test --enable-shared	8m 54s
linux clang test --enable-shared	8m 47s
linux gcc check check-dpdk dpdk	13m 51s
linux clang check check-dpdk dpdk	13m 17s
linux gcc test -ljemalloc	6m 57s
linux clang test -ljemalloc	6m 44s
linux gcc --enable-afxdp	2m 15s
linux clang --enable-afxdp	2m 4s
linux gcc dpdk --enable-shared	2m 57s
linux clang dpdk --enable-shared	2m 45s
linux gcc dpdk-shared	2m 20s
linux clang dpdk-shared	2m 15s
linux gcc dpdk-shared --enable-shared	3m 11s
linux clang dpdk-shared --enable-shared	2m 46s
linux gcc m32 --disable-ssl	2m 2s
	2h 10m 38s

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