Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to b4bbbe86cf1410d6fa10d3d6d2b418133e34c45c
  - Fix instance instantiation for NS/E2E
    
    Change-Id: Icce9c332b740ad7aa44f4e84f9274778542ebced
    Issue-ID: USECASEUI-131
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed