Distinguish unschedulable with unresolvable in scheduler

Before, in RunPostFilterPlugins, we didn't distinguish between unschedulable and unresolvable
because we only have one postFilterPlugin by default, now, we have at least two, we should
make sure that once a postFilterPlugin returns unresolvable, we'll return directly

Signed-off-by: Kante Yin <kerthcet@gmail.com>

pkg/scheduler/framework/interface_test.go

@@ -139,43 +139,6 @@ func assertStatusCode(t *testing.T, code Code, value int) {
 	}
 }
 
-func TestPluginToStatusMerge(t *testing.T) {
-	tests := []struct {
-		name      string
-		statusMap PluginToStatus
-		wantCode  Code
-	}{
-		{
-			name:      "merge Error and Unschedulable statuses",
-			statusMap: PluginToStatus{"p1": NewStatus(Error), "p2": NewStatus(Unschedulable)},
-			wantCode:  Error,
-		},
-		{
-			name:      "merge Success and Unschedulable statuses",
-			statusMap: PluginToStatus{"p1": NewStatus(Success), "p2": NewStatus(Unschedulable)},
-			wantCode:  Unschedulable,
-		},
-		{
-			name:      "merge Success, UnschedulableAndUnresolvable and Unschedulable statuses",
-			statusMap: PluginToStatus{"p1": NewStatus(Success), "p2": NewStatus(UnschedulableAndUnresolvable), "p3": NewStatus(Unschedulable)},
-			wantCode:  UnschedulableAndUnresolvable,
-		},
-		{
-			name:     "merge nil status",
-			wantCode: Success,
-		},
-	}
-
-	for _, test := range tests {
-		t.Run(test.name, func(t *testing.T) {
-			gotStatus := test.statusMap.Merge()
-			if test.wantCode != gotStatus.Code() {
-				t.Errorf("wantCode %v, gotCode %v", test.wantCode, gotStatus.Code())
-			}
-		})
-	}
-}
-
 func TestPreFilterResultMerge(t *testing.T) {
 	tests := map[string]struct {
 		receiver *PreFilterResult