pkg/client/msp msp包

一. pkg/client/msp 包msp支持在Fabric网络上创建和更新用户。 Msp客户端支持以下操作：Enroll，Reenroll，Register，Revoke和GetSigningIdentity。

1. 基本流程:

   1）准备客户端上下文
   2）创建msp客户端
   3）注册用户
   4）注册用户

    1 ctx := mockClientProvider()
    2 
    3 // Create msp client
    4 c, err := New(ctx)
    5 if err != nil {
    6     fmt.Println("failed to create msp client")
    7     return
    8 }
    9 
   10 username := randomUsername()
   11 
   12 enrollmentSecret, err := c.Register(&RegistrationRequest{Name: username})
   13 if err != nil {
   14     fmt.Printf("Register return error %s\n", err)
   15     return
   16 }
   17 
   18 err = c.Enroll(username, WithSecret(enrollmentSecret))
   19 if err != nil {
   20     fmt.Printf("failed to enroll user: %s\n", err)
   21     return
   22 }
   23 fmt.Println("enroll user is completed")

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