Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Update set of region identity attribut

    Use OS_REGION_NAME environment variable if defined

    Conflicts:
        functest/opnfv_tests/openstack/tempest/conf_utils.py

    Change-Id: Ifcdfc468fa4931ab62ac0f3ead103e15af7c0de6
    Signed-off-by: Samuel Bartel <samuel.bartel@orange.com>
    (cherry picked from commit eb793907cee64bbe2519040559b04d47652cabf0)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 888bbc6..f93c1aa 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 888bbc6292e7d0a0121f5d72095df24b6f66d3a7
+Subproject commit f93c1aa48e61e1ad23b54feab4fff6b3d9fe9f26