Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix "Broken pipe" IOErrors of rally run"
  - Fix "Broken pipe" IOErrors of rally run

    Replace obsolete os.popen with subprocess module usage in command
    output retrieval. Do not use shell as the program to execute.

    Change-Id: Ic63bb0f393750c3b85a35a37fecd46c1c1b96602
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e627ff2..185dbcf 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e627ff2e267c1c59461571d23b89b21199e49737
+Subproject commit 185dbcfb6ed774cc2f0478b05041d9e3a4e2f303