Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix how to get tier_name

    The tier name was incorrect when passing a test case as run_test.py arg.

    Change-Id: I6f439fc7b90facb3f0553798bd1fe06ac9f09475
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ccb98c2..3218f1f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ccb98c22390fd97a3bb55aa225c7241cc4daa85d
+Subproject commit 3218f1fa1d7bb265f3b5c50e0853a00446ac2e93