Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix how tier_handler is imported"
  - Fix how tier_handler is imported

    Change-Id: I36577ca73042b181b4634c4d6bf3ac5d905fd560
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 71ba783..60d2025 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 71ba783c1279370af035ff7cac2de7522e95de78
+Subproject commit 60d2025808adf1dad6a41e5df34d0eff9c725e2e