maintainers: claim responsibility for virtio and vhost
maintainers: claim responsibility for virtio and vhost

As original author of virtio PMD (coauthor with Rashmin) and vhost user,
claim responsibility for virtio PMD, vhost lib and vhost example.

Signed-off-by: Huawei Xie <3b3be4428106761300a2ee559c9f71ecdb091553@intel.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

msune/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,tsphillips/dpdk-fork,msune/dpdk,john-mcnamara-intel/dpdk,mixja/dpdk,mixja/dpdk,mixja/dpdk,mixja/dpdk,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,venkynv/dpdk-mirror,tsphillips/dpdk-fork,msune/dpdk,msune/dpdk