Eliminate running paths of Predicates in scheduler

- eliminate running paths of Predicates in scheduler; use Filter Plugins instead.
- refactor all unit tests
- adjust the TestPreemptWithPermitPlugin integration test

pkg/scheduler/testing/BUILD

@@ -5,11 +5,14 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library")
 go_library(
     name = "go_default_library",
     srcs = [
+        "framework_helpers.go",
         "workload_prep.go",
         "wrappers.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/scheduler/testing",
     deps = [
+        "//pkg/scheduler/apis/config:go_default_library",
+        "//pkg/scheduler/framework/v1alpha1:go_default_library",
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
     ],

pkg/scheduler/testing/framework_helpers.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package testing
+
+import (
+	schedulerapi "k8s.io/kubernetes/pkg/scheduler/apis/config"
+	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
+)
+
+// RegisterFilterPluginFunc is a function signature used in method RegisterFilterPlugin()
+// to register a Filter Plugin to a given registry.
+type RegisterFilterPluginFunc func(reg *framework.Registry, plugins *schedulerapi.Plugins, pluginConfigs []schedulerapi.PluginConfig)
+
+// RegisterFilterPlugin returns a function to register a Filter Plugin to a given registry.
+func RegisterFilterPlugin(pluginName string, pluginNewFunc framework.PluginFactory) RegisterFilterPluginFunc {
+	return func(reg *framework.Registry, plugins *schedulerapi.Plugins, pluginConfigs []schedulerapi.PluginConfig) {
+		reg.Register(pluginName, pluginNewFunc)
+		plugins.Filter.Enabled = append(plugins.Filter.Enabled, schedulerapi.Plugin{Name: pluginName})
+		//lint:ignore SA4006 this value of pluginConfigs is never used.
+		//lint:ignore SA4010 this result of append is never used.
+		pluginConfigs = append(pluginConfigs, schedulerapi.PluginConfig{Name: pluginName})
+	}
+}