Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Install releng via requirements.txt"
  - Install releng via requirements.txt

    It should work in all branches if the right requirements.txt is
    selected.

    Change-Id: I9c46cd52496528835a92e371320debf92117b4fa
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index efbe74c..84bd5c6 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit efbe74c4cc1b6b6982e9e13950319f690541d6a3
+Subproject commit 84bd5c62dd21300e96979217dee1e31d75c439ca