fix create cnmooc

app/services/cnmoocs_service.rb

@@ -85,12 +85,14 @@ class CnmoocsService
       lastname: name,
       mail: mail,
       mail_notification: mail,
-      login: login,
       password: OauthController::DEFAULT_PASSWORD,
       certification: 1
     }
     ActiveRecord::Base.transaction do
-      user = User.create!(create_params)
+      user = User.new(create_params)
+      # login 有问题，只能这样赋值
+      user.login = login
+      user.save!
 
       UserExtensions.create!(user_id: user.id, school_id: School.first.id, identity: 4, gender: 0)