Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update juju agents

    It conforms with last juju update.

    Change-Id: I4941aac66e5ac96045090f10f197f6ee2712caac
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a51d422..1ab7a53 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a51d42200d94643314ece1a833181a7193ce2265
+Subproject commit 1ab7a53dab08a6f67ff2cf54f33b70dea0e82bfb