Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Get the right git commit ids

    Co-Authored-By: Linda Wang <wangwulin@huawei.com>
    Change-Id: I08ad30156049ac0814fcebfc0f116176331c1dd3
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 7db506b8c184917d0986b14722bbbf95b7fce3d3)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fed7233..c4b320f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fed72336e3b50b8441f233a2f122e482ee83ae8c
+Subproject commit c4b320f3e292c1348e467cd1438c996510d50af6