Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 85ff13a2ae3243f250ef0d6fa0407e4d11e9adeb
  - Fix instance instantiation for CCVPN
    
    Change-Id: Ic4de910415203dacd4ddf642075c1cb45247fd03
    Issue-ID: USECASEUI-220
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed