Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Move vping_* and cinder_test into healthcheck

    Change-Id: I193c6dcdf90fe8eac46884fe5a5a329b0e5a7322
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 6a3328b..e905fbe 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 6a3328b3e9d77810b725e96d21a225283396cfcf
+Subproject commit e905fbe2253bf43da2661c3a9e67429e0292993a