Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Export env vars via os.environ in test_cli_env.py"
  - Export env vars via os.environ in test_cli_env.py

    CONST shouldn't be used for getting/setting env vars.
    It adds complexity and may raise side effects.

    Change-Id: Id80a03aff6eb908a792f1d07addaad4770e8d0cb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e94f619..7598ab7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e94f6195fb4116fb4228a6c3e600d073de3b6109
+Subproject commit 7598ab763d31ca4f901043722c19635b73f00d3f