v2: Call shim.Delete at first when create is failed

If the context is cancelled during `shim.Create()`, such as the client
disconnects unexpectedly. The created shim will never be deleted.
What's more, if the context is cancelled during `openShimLog()`, the
fifo will be closed and block the shim output.

Signed-off-by: Li Yuxuan <liyuxuan04@baidu.com>

runtime/v2/binary.go

@@ -74,7 +74,7 @@ func (b *binary) Start(ctx context.Context, opts *types.Any, onClose func()) (_
 	if err != nil {
 		return nil, err
 	}
-	f, err := openShimLog(ctx, b.bundle, client.AnonDialer)
+	f, err := openShimLog(context.Background(), b.bundle, client.AnonDialer)
 	if err != nil {
 		return nil, errors.Wrap(err, "open shim log pipe")
 	}