Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to f017831acae673b55b4f9cf717ed92c8e0e667d4
  - style: optimize customer page styles
    
    Change-Id: I2e142b503ff9b2abc02a35fb52bdebf72658d70d
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed