Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Export env vars instead of CONST in refstack"
  - Export env vars instead of CONST in refstack

    JIRA: FUNCTEST-930

    Change-Id: I7f28ee0b9a55c53a11f03509c3f9e8eb37cc43a9
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ae6798b..03ed2e0 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ae6798b7018e609d7a4833599e7915cebc258ac5
+Subproject commit 03ed2e069ddf8fc82428def13862d06bb8e4b105