Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Update graphs in userguide

    1. Functest structural concept
    2. Clearwater architecture

    Change-Id: I88e39d6d08f1eb28a389d2b8a7a1669295f6aa49
    Signed-off-by: Linda Wang <wangwulin@huawei.com>
    (cherry picked from commit ccaa9c9d495575bd16da001a984597456bf152e4)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 406b8a6..c65906e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 406b8a60f1d4f8fb9083c3c0972e07e6e7125c49
+Subproject commit c65906e74c02805308ff99c99bc207ac424437e6