Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to e1ec8dd3eb366b23f82d6ef3fb2c912da9da8fc9
  - Fix instance instantiation for CCVPN
    
    Change-Id: I20f31798b879791dc701945c2cf919bcfb9ec35d
    Issue-ID: USECASEUI-220
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
1 file changed