add CBT bitmap implementation

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

Author: Lyndon-Li

pkg/uploader/cbt/set_test.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 
@@ -129,7 +128,7 @@ func TestSetBitmapOrFull(t *testing.T) {
 
 			if tt.expectedErrStr != "" {
 				require.Error(t, err)
-				assert.EqualError(t, err, tt.expectedErrStr)
+				require.EqualError(t, err, tt.expectedErrStr)
 			} else {
 				require.NoError(t, err)
 			}