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/resource_limits.go

@@ -20,7 +20,7 @@ import (
 	"fmt"
 
 	"k8s.io/api/core/v1"
-	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
+	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
 	schedulernodeinfo "k8s.io/kubernetes/pkg/scheduler/nodeinfo"
 
 	"k8s.io/klog"
@@ -33,10 +33,10 @@ import (
 // of the pod are satisfied, the node is assigned a score of 1.
 // Rationale of choosing the lowest score of 1 is that this is mainly selected to break ties between nodes that have
 // same scores assigned by one of least and most requested priority functions.
-func ResourceLimitsPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedulernodeinfo.NodeInfo) (schedulerapi.HostPriority, error) {
+func ResourceLimitsPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedulernodeinfo.NodeInfo) (framework.NodeScore, error) {
 	node := nodeInfo.Node()
 	if node == nil {
-		return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
+		return framework.NodeScore{}, fmt.Errorf("node not found")
 	}
 
 	allocatableResources := nodeInfo.AllocatableResource()
@@ -71,8 +71,8 @@ func ResourceLimitsPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedule
 		)
 	}
 
-	return schedulerapi.HostPriority{
-		Host:  node.Name,
+	return framework.NodeScore{
+		Name:  node.Name,
 		Score: score,
 	}, nil
 }