Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to de1a4c6aa7a596e45028f67435866152c6f5b496
  - Service instance lifecycle management
    
    Change-Id: If957774ba3cfaa65493efc7c376d4382d46a16dc
    Issue-ID: USECASEUI-218
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed