Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Updated from global requirements

    Change-Id: I16a3f29be0f4e2c8bdcbd9be265fbf3a250cd6ad
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8ff4c9d..820c4c5 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8ff4c9da8e0835cfa2c14edfa2ad8f3d53cbb725
+Subproject commit 820c4c5c313a848f872ecc0416af1ec65a2a46bb