Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Add variablefile as possible robot.run() args

    Change-Id: Ic80840957b4d9c3c4a1615696a2851f3f5bf7bf4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e29b123..89bb802 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e29b1236a4bacc94fd6d13a1744d7979d31a6ed6
+Subproject commit 89bb80232f777b0619d4168b292338c16a0a704c