Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Define env vars for ODL inputs

    It's linked to "Add default param for ODL password" [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/59811/

    Change-Id: Ib88d9371a2b6febb5c1af69ffda9b3c5024999e9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e1dc928..38cc424 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e1dc928517e4c852b25cbb8f7455e49d7ce3ede7
+Subproject commit 38cc424c2a48a14a25b02eea03d70784577753a4