Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove add_images.sh"
  - Remove add_images.sh

    The Docker images should not host any OS image. They shall
    be pre-downloaded and mounted as a docker volume to the
    functest container.

    Also, add scenario argument to skip images that are not needed for
    the scenario

    Change-Id: I652ec32b177ddea73c8a253359e873f13bf0c950
    Signed-off-by: jose.lausuch <jose.lausuch@ericsson.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index a732e24..fe7ff12 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit a732e24c6dc68729dd0f59bdbff3faed6ecd832e
+Subproject commit fe7ff1238e2d086df8538d2c95eafc0a7cb4838d