Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Print vping output instead of Paramiko object

    Change-Id: Iddc1abdf443e482e8748434a4ba7d85709d8cd0e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 085141b..72b17bc 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 085141b3a90ed82e74cce867db2b5dbba8471c38
+Subproject commit 72b17bc82ac5c6a388adbfc8a564f118d0ccd247