Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Add mock to requirements.txt

    Package mock is absent for functest, while it is required by
    decorators.py.

    Change-Id: I0d042def0335e369c4e22a349e3068829e1d2c59
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 284aeae..6dbdeb1 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 284aeae6890c455c43ea8e841db9f8d1f3cf46e2
+Subproject commit 6dbdeb1edc2d92be2c55a1b0dfdcf1fffc05c0a7