Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add a new directory to hold pre-downloaded images"
  - Add a new directory to hold pre-downloaded images

    Put all images in the new direcotry. If users want to use the
    local image, map the local directory to the ${HOME}/functest/images

    Change-Id: I0d309b93f52b3da23d6130056f1a19907313ef68
    Signed-off-by: helenyao <yaohelan@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index dd9fb78..2d0027b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit dd9fb78e0553c35eb60e76b2979dac803f818ecb
+Subproject commit 2d0027b13ed1a5a6f35666b2b74be0fc8b4f7b5f