Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 7e55bc1f50d6fdfca754c04513405b5103c26bf6
  - Merge "Fix instance instantiation for NS"
  - Fix instance instantiation for NS
    
    Change-Id: I8979b70ca2efd8a09d37eb74233e15093a15806a
    Issue-ID: USECASEUI-255
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed