Revert "move go client out"

This reverts commit ef1274edc9.

weed/messaging/client/publisher.go

@@ -0,0 +1,14 @@
+package client
+
+import "github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
+
+type Publisher struct {
+}
+
+func (c *MessagingClient) NewPublisher(namespace, topic string) *Publisher {
+	return &Publisher{}
+}
+
+func (p *Publisher) Publish(m *messaging_pb.RawData) error{
+	return nil
+}