Remove the ability to use [name:tag] in podman load command

Docker does not support this, and it is confusing what to do if
the image has more then one tag.  We are dropping support for this
in podman 3.0

Fixes: https://github.com/containers/podman/issues/7387

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

pkg/api/handlers/libpod/images.go

@@ -353,20 +353,7 @@ func ImagesLoad(w http.ResponseWriter, r *http.Request) {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to load image"))
 		return
 	}
-	split := strings.Split(loadedImage, ",")
-	newImage, err := runtime.ImageRuntime().NewFromLocal(split[0])
-	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
-	// TODO this should go into libpod proper at some point.
-	if len(query.Reference) > 0 {
-		if err := newImage.TagImage(query.Reference); err != nil {
-			utils.InternalServerError(w, err)
-			return
-		}
-	}
-	utils.WriteResponse(w, http.StatusOK, entities.ImageLoadReport{Names: split})
+	utils.WriteResponse(w, http.StatusOK, entities.ImageLoadReport{Names: strings.Split(loadedImage, ",")})
 }
 
 func ImagesImport(w http.ResponseWriter, r *http.Request) {

pkg/api/server/register_images.go

@@ -797,10 +797,6 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// summary: Load image
 	// description: Load an image (oci-archive or docker-archive) stream.
 	// parameters:
-	//   - in: query
-	//     name: reference
-	//     description: "Optional Name[:TAG] for the image"
-	//     type: string
 	//   - in: formData
 	//     name: upload
 	//     description: tarball of container image