Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Read env vars instead of using CONST in API"
  - Read env vars instead of using CONST in API

    Also, improve the way of getting env values.

    JIRA: FUNCTEST-933

    Change-Id: Ia66bbaf683df03c2874fafe578b84bb78a4f3fd1
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 03ed2e0..fd16007 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 03ed2e069ddf8fc82428def13862d06bb8e4b105
+Subproject commit fd16007ccfb7052c3cbab82e6184be277320b83a