[VOL-2193] Create mocks for Kafka Client and Etcd
This commit consists of:
1) A kafka client mock that implements the kafka client interface
under voltha-lib-go/pkg/kafka/client.go
2) An embedded Etcd server that runs in-process and represents an
Etcd server.
Change-Id: I52a36132568e08c596bb4136918bebcb654a3b99
diff --git a/vendor/go.etcd.io/etcd/etcdserver/api/v3client/doc.go b/vendor/go.etcd.io/etcd/etcdserver/api/v3client/doc.go
new file mode 100644
index 0000000..47922c4
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/etcdserver/api/v3client/doc.go
@@ -0,0 +1,45 @@
+// Copyright 2017 The etcd 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 v3client provides clientv3 interfaces from an etcdserver.
+//
+// Use v3client by creating an EtcdServer instance, then wrapping it with v3client.New:
+//
+// import (
+// "context"
+//
+// "go.etcd.io/etcd/embed"
+// "go.etcd.io/etcd/etcdserver/api/v3client"
+// )
+//
+// ...
+//
+// // create an embedded EtcdServer from the default configuration
+// cfg := embed.NewConfig()
+// cfg.Dir = "default.etcd"
+// e, err := embed.StartEtcd(cfg)
+// if err != nil {
+// // handle error!
+// }
+//
+// // wrap the EtcdServer with v3client
+// cli := v3client.New(e.Server)
+//
+// // use like an ordinary clientv3
+// resp, err := cli.Put(context.TODO(), "some-key", "it works!")
+// if err != nil {
+// // handle error!
+// }
+//
+package v3client