Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Bypass mismatches between pbr and readthedocs

    Change-Id: I09400b3b337e6fe8dbc53a52dab925d38227a80a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 4fdae29..4a3259a 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 4fdae297551f0d1be07cf2edd39e3428923b52ae
+Subproject commit 4a3259a29fec5981f628c084da6e60b7c40aba6b