Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Add fallback mechanism if vlan

    private_v4 and public_v4 are incorrectly set when vlan is used as
    overlay.

    JIRA: FUNCTEST-996

    Change-Id: I120a247e92e0fd295769b2a0eeb15ce82a0eabc8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 5522ecd302ee54b494714cb2e1af0fe2381e5c37)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a4bbcd8..4a4db3c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a4bbcd895a0fbf29cb7c2dc396fefb4229573225
+Subproject commit 4a4db3cdb7749db4d61862c466f178e6bad33232