Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Revert "Temporarily switch to collivier/abot_charm"

    This reverts commit d2c129f8319503a8fabe5b87c71737845f06ab36.

    Change-Id: Ie8e067486365cd5cc848d307f0078540eac08dcb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d2c129f..c234d99 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d2c129f8319503a8fabe5b87c71737845f06ab36
+Subproject commit c234d9954d101574e036e41e4ed435130486e02c