vhost v0.16.0

vhost v0.16.0

Added

• [#251] Add SHMEM_MAP and SHMEM_UNMAP support
• [#336] Add frontend support for device state transfer (VHOST_USER_PROTOCOL_F_DEVICE_STATE)
• [#339] Add support for GET_SHMEM_CONFIG message

Changed

• [#338] Implement From<Error> for io::Error, rename Backend::node to inner and inline lock() calls
• [#347] Shift feature bits to accommodate GET_VRING_BASE_INFLIGHT spec change

Fixed

• [#338] vhost: fix double-locking in Backend to Frontend request handlers
• [#342] vhost-user: frontend: Read the full reply for set_log_base