Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to a51d51e70f074f0ff0992ae346983969dec32e1e
  - feat: modify the package-lock.json to support the map of new npm package
    
    Change-Id: Id1b467176a8c61273ed65eda31ba3aace27daa6e
    Issue-ID: USECASEUI-374
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed