Set the policy mapping for a user or group (#8036)

Add API to set policy mapping for a user or group

Contains a breaking Admin APIs change.

- Also enforce all applicable policies
- Removes the previous /set-user-policy API

 Bump up peerRESTVersion

Add get user info API to show groups of a user

cmd/peer-rest-client.go

@@ -406,6 +406,22 @@ func (client *peerRESTClient) LoadPolicy(policyName string) (err error) {
 	return nil
 }
 
+// LoadPolicyMapping - reload a specific policy mapping
+func (client *peerRESTClient) LoadPolicyMapping(userOrGroup string, isGroup bool) error {
+	values := make(url.Values)
+	values.Set(peerRESTUserOrGroup, userOrGroup)
+	if isGroup {
+		values.Set(peerRESTIsGroup, "")
+	}
+
+	respBody, err := client.call(peerRESTMethodLoadPolicyMapping, values, nil, -1)
+	if err != nil {
+		return err
+	}
+	defer http.DrainBody(respBody)
+	return nil
+}
+
 // DeleteUser - delete a specific user.
 func (client *peerRESTClient) DeleteUser(accessKey string) (err error) {
 	values := make(url.Values)