Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Clean base images only if 1 container was built

    Conflicts:
        build.sh

    Change-Id: I0134082d2d150a6dc58e679f9ade81eb6c040266
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 20d22666aa841f0128b3f53a07ba0f31684537d8)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f9e7142..5e3bf15 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f9e71426234fb0303b937d63cfa0020d4b24a267
+Subproject commit 5e3bf15dfd827c41d6a52ad40711a8ec0fbe42f7