Add grpc service to shim

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

utils/socket.go

@@ -0,0 +1,19 @@
+package utils
+
+import (
+	"net"
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// CreateUnixSocket creates a unix socket and returns the listener
+func CreateUnixSocket(path string) (net.Listener, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0660); err != nil {
+		return nil, err
+	}
+	if err := syscall.Unlink(path); err != nil && !os.IsNotExist(err) {
+		return nil, err
+	}
+	return net.Listen("unix", path)
+}