Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix default identity version in conf_utils

    Change-Id: I2e78958b3c96b36a5fac636a1817424fb102afea
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d0ffb7d..8901655 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d0ffb7dd996ddd43a1e0fe78fb28ee88cb167fd6
+Subproject commit 8901655587941e853739760bd41f7a00cf71d61d