Import vsock crate.

Bug: 171249434
Change-Id: I1b86487a9681af1007beb8a3b4dda64586ddde79

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+# vsock-rs
+
+Virtio socket support for Rust. Implements VsockListener and VsockStream
+which are analogous to the `std::net::TcpListener` and `std::net::TcpStream` types. 
+
+## Usage
+
+Refer to the crate [documentation](https://docs.rs/vsock).
+
+## Testing
+
+### Prerequisites
+
+You will need a recent qemu-system-x86_64 build in your path.
+
+### Host
+
+Setup the required virtio kernel modules:
+
+```
+make kmod
+```
+
+Start the test vm, you can shutdown the vm with the keyboard shortcut ```Ctrl+A``` and then ```x```:
+
+```
+make vm
+```
+
+### Tests
+
+Run the test suite with:
+
+```
+make check
+```
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