Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix the tempest error when creating snapshot"
  - Fix the tempest error when creating snapshot

    Change-Id: I9682f174a835d2bdf1ef3da01e369037e5ad7247
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c67c668..671b335 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c67c6687976a486af880ece2e6831d7ef7fbbdcc
+Subproject commit 671b3356e8fc7c6219919f978a3dee6b69e8c663