plugins: add plugins from containernetworking/cni

Plugins prepared from the containernetworking/cni repo as follows:

1) git reset --hard 1a9288c3c0
2) git remove everything not in plugins/
3) git remove plugins/test
4) git merge into containernetworking/plugins repo
5) adjust import paths for containernetworking/cni -> containernetworking/plugins

plugins/ipam/host-local/backend/testing/fake_store.go

@@ -0,0 +1,77 @@
+// Copyright 2015 CNI 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 (
+	"net"
+
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend"
+)
+
+type FakeStore struct {
+	ipMap          map[string]string
+	lastReservedIP net.IP
+}
+
+// FakeStore implements the Store interface
+var _ backend.Store = &FakeStore{}
+
+func NewFakeStore(ipmap map[string]string, lastIP net.IP) *FakeStore {
+	return &FakeStore{ipmap, lastIP}
+}
+
+func (s *FakeStore) Lock() error {
+	return nil
+}
+
+func (s *FakeStore) Unlock() error {
+	return nil
+}
+
+func (s *FakeStore) Close() error {
+	return nil
+}
+
+func (s *FakeStore) Reserve(id string, ip net.IP) (bool, error) {
+	key := ip.String()
+	if _, ok := s.ipMap[key]; !ok {
+		s.ipMap[key] = id
+		s.lastReservedIP = ip
+		return true, nil
+	}
+	return false, nil
+}
+
+func (s *FakeStore) LastReservedIP() (net.IP, error) {
+	return s.lastReservedIP, nil
+}
+
+func (s *FakeStore) Release(ip net.IP) error {
+	delete(s.ipMap, ip.String())
+	return nil
+}
+
+func (s *FakeStore) ReleaseByID(id string) error {
+	toDelete := []string{}
+	for k, v := range s.ipMap {
+		if v == id {
+			toDelete = append(toDelete, k)
+		}
+	}
+	for _, ip := range toDelete {
+		delete(s.ipMap, ip)
+	}
+	return nil
+}