[I386]The taskbar was on the top of the screen at first login of the new user.

[Machine]
Dell Vostro 3900
  [Version]
18.04 daily 20180412 +
kylin-video_1.1.6-0ubuntu2、
youker-assistant_3.0.4、
Ukui-control-center_1.1.2-0ubuntu1

  [Details]
[I386]The taskbar was on the top of the screen at first login of the new user.
【i386】创建新用户test，首次登录，出现任务栏显示在上方

  [Test Case]
1. Create a new user
2. Login the new user and check the taskbar
Expected Result:on the bottom of the screen
Actual Result:on the top of the screen