Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Patch Functest docker images for ARM

    A new tox env is defined to ease patching all Dockerfiles for ARM.
    This env will only patch the Dockerfile related to functest-core when
    the manifests are published.

    Jenkins jobs can simply apply the next command:
        $ tox -e patcharm64

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: Icf69e27c1da95a721ebf67d5ce190c9b8cefce0a
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5d60559..ed4a25b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5d60559a1d22a027b1f9b0e5f2494415dca19784
+Subproject commit ed4a25b111f43f570c8cb86d53f54127d8e20b0b