Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to bf240f4fad6e8bf032bd1f190b238682a9fb721a
  - User and service type management interface
    
    Change-Id: Ie4f66f28ea964cd8a773e7c1c52e5d589762b371
    Issue-ID: USECASEUI-212
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index b4bbbe8..bf240f4 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit b4bbbe86cf1410d6fa10d3d6d2b418133e34c45c
+Subproject commit bf240f4fad6e8bf032bd1f190b238682a9fb721a