Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 3c3840524ee11c1385045e9801918bcb05b71fb5
  - feat: delete useless modules and update tomcat version
    
    Change-Id: I38d0c0b65cf210074c7222a535f1b3d7c150f53d
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 19abe2a..3c38405 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 19abe2af19ba49073949f8254aec897afe7bb303
+Subproject commit 3c3840524ee11c1385045e9801918bcb05b71fb5