Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Modified Dockerfile.aarch to a patch

    Docker image for functest on ARM was build using a different Dockerfile.
    Now the ARM Dockerfile is created with a patch,
    in order to avoid modifying both files.
    This Dockerfile.aarch64.patch is applied by opnfv-docker.sh from releng project.

    Change-Id: Ib3d4230b79811a9c563b2687a78e8c4724f7efc7
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ff66139..27ee75b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ff66139d445b0401763043764d2e243c21dc5f56
+Subproject commit 27ee75b4d83d3465621567424919182049a23db0