build, misc: Bump vmm-sys-util dependency

The structure of the vmm-sys-util crate has changed with lots of code
moving to submodules.

This change adjusts the use of the imported structs to reference the
submodules.

Fixes: #145

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

vhost_rs/src/backend.rs

@@ -11,7 +11,7 @@
 
 use super::Result;
 use std::os::unix::io::RawFd;
-use vmm_sys_util::EventFd;
+use vmm_sys_util::eventfd::EventFd;
 
 /// Maximum number of memory regions supported.
 pub const VHOST_MAX_MEMORY_REGIONS: usize = 255;

vhost_rs/src/vhost_kern/mod.rs

@@ -15,8 +15,8 @@ use std::os::unix::io::{AsRawFd, RawFd};
 use std::ptr::null;
 
 use vm_memory::{Address, GuestAddress, GuestMemory, GuestUsize};
+use vmm_sys_util::eventfd::EventFd;
 use vmm_sys_util::ioctl::{ioctl, ioctl_with_mut_ref, ioctl_with_ptr, ioctl_with_ref};
-use vmm_sys_util::EventFd;
 
 use super::{
     Error, Result, VhostBackend, VhostUserMemoryRegionInfo, VringConfigData,

vhost_rs/src/vhost_user/master.rs

@@ -8,7 +8,7 @@ use std::os::unix::io::{AsRawFd, RawFd};
 use std::os::unix::net::UnixStream;
 use std::sync::{Arc, Mutex};
 
-use vmm_sys_util::EventFd;
+use vmm_sys_util::eventfd::EventFd;
 
 use super::connection::Endpoint;
 use super::message::*;

vhost_rs/src/vhost_user/mod.rs

@@ -116,10 +116,10 @@ impl Error {
     }
 }
 
-impl std::convert::From<vmm_sys_util::Error> for Error {
+impl std::convert::From<vmm_sys_util::errno::Error> for Error {
     /// Convert raw socket errors into meaningful vhost-user errors.
     ///
-    /// The vmm_sys_util::Error is a simple wrapper over the raw errno, which doesn't means much
+    /// The vmm_sys_util::errno::Error is a simple wrapper over the raw errno, which doesn't means much
     /// to the vhost-user connection manager. So convert it into meaningful errors to simplify
     /// the connection manager logic.
     ///
@@ -128,7 +128,7 @@ impl std::convert::From<vmm_sys_util::Error> for Error {
     /// * - Error::SocketBroken: the underline socket is broken.
     /// * - Error::SocketError: other socket related errors.
     #[allow(unreachable_patterns)] // EWOULDBLOCK equals to EGAIN on linux
-    fn from(err: vmm_sys_util::Error) -> Self {
+    fn from(err: vmm_sys_util::errno::Error) -> Self {
         match err.errno() {
             // The socket is marked nonblocking and the requested operation would block.
             libc::EAGAIN => Error::SocketRetry(IOError::from_raw_os_error(libc::EAGAIN)),

vhost_rs/src/vhost_user/sock_ctrl_msg.rs

@@ -16,7 +16,7 @@ use std::ptr::{copy_nonoverlapping, null_mut, write_unaligned};
 use libc::{
     c_long, c_void, cmsghdr, iovec, msghdr, recvmsg, sendmsg, MSG_NOSIGNAL, SCM_RIGHTS, SOL_SOCKET,
 };
-use vmm_sys_util::{Error, Result};
+use vmm_sys_util::errno::{Error, Result};
 
 // Each of the following macros performs the same function as their C counterparts. They are each
 // macros because they are used to size statically allocated arrays.
@@ -335,7 +335,7 @@ mod tests {
 
     use libc::cmsghdr;
 
-    use vmm_sys_util::EventFd;
+    use vmm_sys_util::eventfd::EventFd;
 
     #[test]
     fn buffer_len() {