sandbox: support vsock connection to task api

Signed-off-by: Abel Feng <fshb1988@gmail.com>

vendor/github.com/mdlayher/socket/setbuffer_others.go

@@ -0,0 +1,16 @@
+//go:build !linux
+// +build !linux
+
+package socket
+
+import "golang.org/x/sys/unix"
+
+// setReadBuffer wraps the SO_RCVBUF setsockopt(2) option.
+func (c *Conn) setReadBuffer(bytes int) error {
+	return c.SetsockoptInt(unix.SOL_SOCKET, unix.SO_RCVBUF, bytes)
+}
+
+// setWriteBuffer wraps the SO_SNDBUF setsockopt(2) option.
+func (c *Conn) setWriteBuffer(bytes int) error {
+	return c.SetsockoptInt(unix.SOL_SOCKET, unix.SO_SNDBUF, bytes)
+}