Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 71508d68626d2a38abc3ad9c896061feab719a42
  - Merge "fix: Fix the bug that the model msg is error when deleting the vnf package"
  - fix: Fix the bug that the model msg is error when deleting the vnf package
    
    Change-Id: I95baaba0184434c0609a9efe1cf0161377726eeb
    Issue-ID: USECASEUI-305
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 6714c07..71508d6 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 6714c077a8b9380776def2fd9e39bd4d694678fc
+Subproject commit 71508d68626d2a38abc3ad9c896061feab719a42