fix: Change user MFA requset payload method from unstructured format to flag (#599)

Signed-off-by: daeyeonko <kkdy21@naver.com>

Author: kkdy21

proto/spaceone/api/identity/v2/user.proto

@@ -117,7 +117,6 @@ enum UserRequiredAction {
   ENFORCE_MFA = 1;
 }
 
-
 message MFA {
   enum State {
     NONE = 0;
@@ -162,9 +161,10 @@ message CreateUserRequest {
   // If reset_password is true, send email
   bool reset_password = 9;
   // +optional
-  MFA mfa = 10;
+  optional bool enforce_mfa = 10;
   // +optional
-  repeated UserRequiredAction required_actions = 11;
+  string enforce_mfa_type = 11;
+
 }
 
 //{
@@ -194,9 +194,9 @@ message UpdateUserRequest {
   // +optional
   bool reset_password = 8;
   // +optional
-  MFA mfa = 9;
+  optional bool enforce_mfa = 9;
   // +optional
-  repeated UserRequiredAction required_actions = 10;
+  string enforce_mfa_type = 10;
 }
 
 //{