Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Add shebang in snaps_suite_builder.py

    Change-Id: I3392068b4a47d35bf0d91fe6d93f2de268f198bf
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 798e5c472b6ac53bbf3b0b800f16069c50657df7)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 34bdcde..1b5b20b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 34bdcde999cefee25d71a55b8779c80f817fb58e
+Subproject commit 1b5b20be96f9ed46e23f3b7feb3ee63f8731345b