Fix accessibility in a JSON-unmarshalled struct (spotted by go vet).

pkg/haproxy/dataplane.go

@@ -496,8 +496,8 @@ func (client *DataplaneClient) Reloaded(id string) (bool, ReloadState, error) {
 }
 
 type sitesBody struct {
-	version int          `json:"_version,omitempty"`
-	sites   models.Sites `json:"data"`
+	Version int          `json:"_version,omitempty"`
+	Sites   models.Sites `json:"data"`
 }
 
 // OffldrStatus returns true iff the offloader site has been loaded by
@@ -535,14 +535,14 @@ func (client *DataplaneClient) OffldrStatus() (
 	if err = json.Unmarshal(body, &sb); err != nil {
 		return
 	}
-	if err = sb.sites.Validate(fmts); err != nil {
+	if err = sb.Sites.Validate(fmts); err != nil {
 		return
 	}
 	if version == 0 {
-		version = sb.version
+		version = sb.Version
 	}
 	// XXX what if version from body & the header don't match?
-	for _, site := range []*models.Site(sb.sites) {
+	for _, site := range []*models.Site(sb.Sites) {
 		if site.Name == frontend {
 			loaded = true
 			break