Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove the tox venv patcharm64"
  - Remove the tox venv patcharm64

    It's now useless as Jenkins jobs call build.sh which modifies all
    Dockerfiles for both architectures.

    build.sh allows building private images as opposed to this former tox
    entry which only take opnfv into account.

    Change-Id: I21e2e5303b4310e053cf013cb7f0e0c4532d5db5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e3dd25f..83f2503 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e3dd25f083c7a1e2e91ef6de59859b032150131b
+Subproject commit 83f250371ce6782f069dfee068a19d9b90415666