Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Update the version of refstack set to 2017.09"
  - Update the version of refstack set to 2017.09

    JIRA: FUNCTEST-890

    Change-Id: Iac2f833fa2b704cd7caa6083e39e48e2df315890
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 60f4c4a..e3dd25f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 60f4c4ad8f982aa2972f58384ceb6d750877d1e1
+Subproject commit e3dd25f083c7a1e2e91ef6de59859b032150131b