Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 7278c889b414b54995f9599a3955be5be9d255f6
  - Merge "Package management interface development"
  - Package management interface development
    
    Change-Id: I032e0642724fe4f2696453d50583538d827232f0
    Issue-ID: USECASEUI-211
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed