Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to a14b29c7a22bbb7f453bf2bb89ec692694243073
  - Merge "Migrate to gerrit-maven-stage (UI)"
  - Migrate to gerrit-maven-stage (UI)

    Update oparent version to 2.0.0 which supports
    global-jjb maven-stage job.

    Change-Id: I9d57e7e89cc48d7c29aa805307129a17181eb898
    Issue-ID: CIMAN-234
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>

diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 8c7857b..a14b29c 160000 (submodule)
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 8c7857b2f978ae0d19e95cc637eb4afe8fca6f96
+Subproject commit a14b29c7a22bbb7f453bf2bb89ec692694243073