Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Stop updating test_db_url in config file by env var"
  - Stop updating test_db_url in config file by env var

    If TEST_DB_URL is declared in env variable, use it
    before considering the var in config file.

    Change-Id: I656ad8765287c48d60af7ab88b421805d76fb231
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c38d87b..4047bc9 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c38d87b9a57466a5663395926a576a87623eb2f4
+Subproject commit 4047bc91468525ca4f46c63d74dbe9fc9521e49f