refactor scheduler extender related API

- move extender related API from pkg/scheduler/api to pkg/scheduler/apis/extender/v1

- alias extenderv1 to pkg/scheduler/apis/extender/v1

- use NodeScore and NodeScoreList in non-extender logic

pkg/scheduler/algorithm/priorities/test_util.go

@@ -17,10 +17,12 @@ limitations under the License.
 package priorities
 
 import (
+	"sort"
+
 	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
+	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
 )
 
@@ -57,8 +59,8 @@ func makeNodeWithExtendedResource(node string, milliCPU, memory int64, extendedR
 }
 
 func priorityFunction(mapFn PriorityMapFunction, reduceFn PriorityReduceFunction, metaData interface{}) PriorityFunction {
-	return func(pod *v1.Pod, nodeNameToInfo map[string]*schedulernodeinfo.NodeInfo, nodes []*v1.Node) (schedulerapi.HostPriorityList, error) {
-		result := make(schedulerapi.HostPriorityList, 0, len(nodes))
+	return func(pod *v1.Pod, nodeNameToInfo map[string]*schedulernodeinfo.NodeInfo, nodes []*v1.Node) (framework.NodeScoreList, error) {
+		result := make(framework.NodeScoreList, 0, len(nodes))
 		for i := range nodes {
 			hostResult, err := mapFn(pod, metaData, nodeNameToInfo[nodes[i].Name])
 			if err != nil {
@@ -74,3 +76,12 @@ func priorityFunction(mapFn PriorityMapFunction, reduceFn PriorityReduceFunction
 		return result, nil
 	}
 }
+
+func sortNodeScoreList(out framework.NodeScoreList) {
+	sort.Slice(out, func(i, j int) bool {
+		if out[i].Score == out[j].Score {
+			return out[i].Name < out[j].Name
+		}
+		return out[i].Score < out[j].Score
+	})
+}