Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix pylint errors/warnings in rally"
  - Fix pylint errors/warnings in rally

    JIRA: FUNCTEST-906

    Change-Id: I484f9a291d5adbedb855450e4ff067dfa4a3b2ae
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 41d7f56..bad712f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 41d7f56276e1bb6c5b25695857bcd3ac2408b2ec
+Subproject commit bad712f34309cf4cf09701e900b832b2503761f6