CHROMIUM: Ignore vsock test cases

Disable vsock test cases accessing /dev/vhost-vsock, which is unavailable in chroot.

BUG=b:181227406
TEST=cargo test --all-features in chroot

Change-Id: I99a80330597c7e281f73ed60aa798ec99f307e3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/rust-vmm/vhost/+/2759311
Tested-by: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Commit-Queue: Keiichi Watanabe <keiichiw@chromium.org>
diff --git a/src/vhost_kern/vsock.rs b/src/vhost_kern/vsock.rs
index ace5a1f..388d500 100644
--- a/src/vhost_kern/vsock.rs
+++ b/src/vhost_kern/vsock.rs
@@ -84,7 +84,9 @@
     use super::*;
     use crate::{VhostBackend, VhostUserMemoryRegionInfo, VringConfigData};
 
+    // Ignore all tests because /dev/vhost-vsock is unavailable in Chrome OS chroot.
     #[test]
+    #[ignore]
     fn test_vsock_new_device() {
         let m = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), 0x10_0000)]).unwrap();
         let vsock = Vsock::new(&m).unwrap();
@@ -95,6 +97,7 @@
     }
 
     #[test]
+    #[ignore]
     fn test_vsock_is_valid() {
         let m = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), 0x10_0000)]).unwrap();
         let vsock = Vsock::new(&m).unwrap();
@@ -119,6 +122,7 @@
     }
 
     #[test]
+    #[ignore]
     fn test_vsock_ioctls() {
         let m = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), 0x10_0000)]).unwrap();
         let vsock = Vsock::new(&m).unwrap();