Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "refstack-client userguide"
  - 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>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 9b22873..13e69b1 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 9b228735d14cd91e31206bcde6d15f85b9d3e026
+Subproject commit 13e69b1bdba3a90d25dd6d1138e3df9fb26db521