Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Improve the way of getting env values"
  - Improve the way of getting env values

    It simply reads env vars instead of calling CONST.__getattribute__()

    Change-Id: If3137f3cfb9f3102388988a82393b9b2f4e99f60
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5387e9a..ae6798b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5387e9adab29aa72a0cbdea0615799eccaf6781d
+Subproject commit ae6798b7018e609d7a4833599e7915cebc258ac5