Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update Xtesting to 0.41

    It includes an enhancement about logger (needed by sdnvpn).

    Change-Id: I05173d2f5b86e12f6badc83e9ee71ecd5898ecee
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 694f7a7..a5e4594 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 694f7a7274bd2b909394bbbb22e47d09937d26a7
+Subproject commit a5e45945650378fb6281f0a392b2ed53586dc18f