Move scheduler code out of plugin directory.

This moves plugin/pkg/scheduler to pkg/scheduler and
plugin/cmd/kube-scheduler to cmd/kube-scheduler.

Bulk of the work was done with gomvpkg, except for kube-scheduler main
package.

pkg/scheduler/util/utils_test.go

@@ -0,0 +1,95 @@
+/*
+Copyright 2017 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 util
+
+import (
+	"testing"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/kubernetes/pkg/apis/scheduling"
+)
+
+// TestGetPodPriority tests GetPodPriority function.
+func TestGetPodPriority(t *testing.T) {
+	p := int32(20)
+	tests := []struct {
+		name             string
+		pod              *v1.Pod
+		expectedPriority int32
+	}{
+		{
+			name: "no priority pod resolves to static default priority",
+			pod: &v1.Pod{
+				Spec: v1.PodSpec{Containers: []v1.Container{
+					{Name: "container", Image: "image"}},
+				},
+			},
+			expectedPriority: scheduling.DefaultPriorityWhenNoDefaultClassExists,
+		},
+		{
+			name: "pod with priority resolves correctly",
+			pod: &v1.Pod{
+				Spec: v1.PodSpec{Containers: []v1.Container{
+					{Name: "container", Image: "image"}},
+					Priority: &p,
+				},
+			},
+			expectedPriority: p,
+		},
+	}
+	for _, test := range tests {
+		if GetPodPriority(test.pod) != test.expectedPriority {
+			t.Errorf("expected pod priority: %v, got %v", test.expectedPriority, GetPodPriority(test.pod))
+		}
+
+	}
+}
+
+// TestSortableList tests SortableList by storing pods in the list and sorting
+// them by their priority.
+func TestSortableList(t *testing.T) {
+	higherPriority := func(pod1, pod2 interface{}) bool {
+		return GetPodPriority(pod1.(*v1.Pod)) > GetPodPriority(pod2.(*v1.Pod))
+	}
+	podList := SortableList{CompFunc: higherPriority}
+	// Add a few Pods with different priorities from lowest to highest priority.
+	for i := 0; i < 10; i++ {
+		var p int32 = int32(i)
+		pod := &v1.Pod{
+			Spec: v1.PodSpec{
+				Containers: []v1.Container{
+					{
+						Name:  "container",
+						Image: "image",
+					},
+				},
+				Priority: &p,
+			},
+		}
+		podList.Items = append(podList.Items, pod)
+	}
+	podList.Sort()
+	if len(podList.Items) != 10 {
+		t.Errorf("expected length of list was 10, got: %v", len(podList.Items))
+	}
+	var prevPriority = int32(10)
+	for _, p := range podList.Items {
+		if *p.(*v1.Pod).Spec.Priority >= prevPriority {
+			t.Errorf("Pods are not soreted. Current pod pririty is %v, while previous one was %v.", *p.(*v1.Pod).Spec.Priority, prevPriority)
+		}
+	}
+}