Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 2fa013e2aab85f943e75356a4b6743f8efa6e36d
  - Service instance lifecycle management
    
    Change-Id: Ic4d63972757adf2a21e59a39990d8c8b504fb812
    Issue-ID: USECASEUI-218
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed