Update git submodules

* Update docs/submodules/functest from branch 'master'
  - 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>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index b66827d..5522ecd 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit b66827d753e09c29cd6f541119dc0ec4c6344511
+Subproject commit 5522ecd302ee54b494714cb2e1af0fe2381e5c37