Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 612e1f0f4133df671a376be5235cf3c4b2cfbb1a
  - Merge "Fix instance detail for CCVPN"
  - Fix instance detail for CCVPN
    
    Change-Id: Ide2897443286f5f890e58f4cc8c604f9994852d6
    Issue-ID: USECASEUI-222
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed