Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add baro_tests as requirements"
  - Add baro_tests as requirements

    It also stops cloning it when building the docker container and updates
    the related unit tests.

    It bypasses the bug when importing collectd [1].

    [1] https://jira.opnfv.org/browse/BAROMETER-79

    Change-Id: Ie9f8ea2b3c95d6b1f5405d76b018cdcb62343a58
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 84bd5c6..7e6191e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 84bd5c62dd21300e96979217dee1e31d75c439ca
+Subproject commit 7e6191e9d4f3734efb1aacf2ded8c20b16aeb4af