Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Update releng git commit id

    It mainly integrates "Do not use capital letters to refer to osa" [1]
    required by OPNFV SFC.

    [1] https://gerrit.opnfv.org/gerrit/#/c/44253

    Change-Id: I658cfd5bbda91eeecb0c40a096ac5e630e427b09
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 46d8d2e..17ab989 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 46d8d2e314a4cc0b394fefc1d4c35f83fe163a57
+Subproject commit 17ab989e67dc6bbead799d62a39dcdb883433e89