Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Update Xtesting to 0.32

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

    Change-Id: Ie906cf895605cedb4c495dd845e8cd6be91e21db
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 08e65be..a52502c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 08e65bef2cc9f9104fd75d6253607c4291f8b046
+Subproject commit a52502ca91e15bcdfa280e15601c53a62d365cd6