vhost: supported features
vhost: supported features

VHOST_SUPPORTED_FEATURES is the feature mask that vhost lib supports.
VHOST_FEATURES is the feature mask vhost currently supports after some features are turned on/off.

Signed-off-by: Huawei Xie <3b3be4428106761300a2ee559c9f71ecdb091553@intel.com>
Acked-by: Changchun Ouyang <593bf1f161e79772915ea885e47cf0e95f4498c0@intel.com>
[Thomas: split patch]

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