Update git submodules

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

    This reverts commit 41177bc31389f923580278a0b914e511322961b2.

    Change-Id: Ic4e7f790ed084713eeb930d86f00af0989d46874
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 41177bc..24b16fd 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 41177bc31389f923580278a0b914e511322961b2
+Subproject commit 24b16fde51b3db38d0795dd4390d2fee189c0d19