add go imports to enable specific cherry-pick of 913eb99

So that we don't have bring in the entire commit d3d1aab

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

components/engine/pkg/gitutils/gitutils_test.go

@@ -12,6 +12,9 @@ import (
 	"runtime"
 	"strings"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestParseRemoteURL(t *testing.T) {