Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Dedicated flavors for rally tests" into stable/euphrates
  - Dedicated flavors for rally tests

    Create flavors and use them in rally scenarios instead of expecting
    certain flavors to pre-exist.

    Change-Id: I77c94ab80fcabd7b80ffb36f9856a48121858009
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>
    (cherry picked from commit 3b98874f010329198b8c3a13a4711c17a593b9cc)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 1bd1a6c..12b13d1 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 1bd1a6c1daed7f68ceb5cc46940061b663041d91
+Subproject commit 12b13d1816eea129ff19379a6d2b8ba03e176840