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/algorithm/priorities/resource_allocation.go

@@ -0,0 +1,82 @@
+/*
+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 priorities
+
+import (
+	"fmt"
+
+	"github.com/golang/glog"
+	"k8s.io/api/core/v1"
+	priorityutil "k8s.io/kubernetes/pkg/scheduler/algorithm/priorities/util"
+	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
+	"k8s.io/kubernetes/pkg/scheduler/schedulercache"
+)
+
+type ResourceAllocationPriority struct {
+	Name   string
+	scorer func(requested, allocable *schedulercache.Resource) int64
+}
+
+func (r *ResourceAllocationPriority) PriorityMap(
+	pod *v1.Pod,
+	meta interface{},
+	nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error) {
+	node := nodeInfo.Node()
+	if node == nil {
+		return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
+	}
+	allocatable := nodeInfo.AllocatableResource()
+
+	var requested schedulercache.Resource
+	if priorityMeta, ok := meta.(*priorityMetadata); ok {
+		requested = *priorityMeta.nonZeroRequest
+	} else {
+		// We couldn't parse metadatat - fallback to computing it.
+		requested = *getNonZeroRequests(pod)
+	}
+
+	requested.MilliCPU += nodeInfo.NonZeroRequest().MilliCPU
+	requested.Memory += nodeInfo.NonZeroRequest().Memory
+
+	score := r.scorer(&requested, &allocatable)
+
+	if glog.V(10) {
+		glog.Infof(
+			"%v -> %v: %v, capacity %d millicores %d memory bytes, total request %d millicores %d memory bytes, score %d",
+			pod.Name, node.Name, r.Name,
+			allocatable.MilliCPU, allocatable.Memory,
+			requested.MilliCPU+allocatable.MilliCPU, requested.Memory+allocatable.Memory,
+			score,
+		)
+	}
+
+	return schedulerapi.HostPriority{
+		Host:  node.Name,
+		Score: int(score),
+	}, nil
+}
+
+func getNonZeroRequests(pod *v1.Pod) *schedulercache.Resource {
+	result := &schedulercache.Resource{}
+	for i := range pod.Spec.Containers {
+		container := &pod.Spec.Containers[i]
+		cpu, memory := priorityutil.GetNonzeroRequests(&container.Resources.Requests)
+		result.MilliCPU += cpu
+		result.Memory += memory
+	}
+	return result
+}