Update git submodules

* Update docs/submodules/functest from branch 'stable/danube'
  - refstack-client userguide

    JIRA: FUNCTEST-758

    container setup steps are skipped, since they already
    included in the functest userguide documents.

    Change-Id: I729d4c3174b03706624a7235da24cb3043b28c2c
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>
    (cherry picked from commit 11826f38829dd5952830d6d2e50ac4918be528f1)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index dd90f44..b69ce13 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit dd90f440a875c2d0235ff53dc699b94e35a09258
+Subproject commit b69ce133a5c16a5d9e9a55e24df5aa75eb05c8ea