Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 31509ed10df8d254647bbad39739f42b378cff90
  - feat: support jonit test
    
    Change-Id: Id337965c68f9636cab8dc14b9ba91773bdefebe3
    Issue-ID: USECASEUI-352
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed