scheduler/volumebinding: move all volume binding logic into VolumeBinding plugin

pkg/scheduler/testing/framework_helpers.go

@@ -99,8 +99,14 @@ func getPluginSetByExtension(plugins *schedulerapi.Plugins, extension string) *s
 		return initializeIfNeeded(&plugins.Bind)
 	case "Reserve":
 		return initializeIfNeeded(&plugins.Reserve)
+	case "Unreserve":
+		return initializeIfNeeded(&plugins.Unreserve)
 	case "Permit":
 		return initializeIfNeeded(&plugins.Permit)
+	case "PreBind":
+		return initializeIfNeeded(&plugins.PreBind)
+	case "PostBind":
+		return initializeIfNeeded(&plugins.PostBind)
 	default:
 		return nil
 	}