Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Simplify vping_ssh

    It directly calls ping from the ssh socket.
    It fixes a possible missing security rule.

    It stops blocking if vpings are in failure.

    Change-Id: I64092a155bb134fa8b7d31d0d13f695e019540d1
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 1b0c4e1..213ca8e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 1b0c4e1e2466dd92585ddb06ff00198ae62e2ebd
+Subproject commit 213ca8e4e4d155ed6d5626020e56c3a241d1dace