Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - 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>
    (cherry picked from commit 8335acdf080e4d31fd1dd70f11aa456b4795833a)
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/functest b/docs/submodules/functest
-Subproject 777acd341ff407838440dae3ed69291ec4c5262
+Subproject a508c431dd66aa86b27b06da716ffe6a8b63409