Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Introduce Euphrates main changes"
  - Introduce Euphrates main changes

    6 topics:
    - functest framework
    - requirement management
    - python packages
    - docker slicing
    - docker builds
    - REST API

    Change-Id: Ib25a2df9f1a723861606355aea95f61d53495794
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c0e6d30..cc26b57 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c0e6d306e0bbc72463c1c0ce46e283425444de53
+Subproject commit cc26b57d00b1d5dee299c9b47b25f8f472ac3eb8