Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Migrates master to use direct upstream

    We now move master to deploy from upstream.  That means we do not need
    to build undercloud/overcloud images anymore.

    Changes-Include:
     - Remove bash build scripts as we do not need to build anything
       other than the python package anymore
     - Remove building images or iso from build.py
     - Remove building of images and iso from Makefile
     - Rename/refactor deploy settings files for nosdn and odl.  The new
       convention is that the typical scenario names we use will deploy
       master.  We also support n-1 OS, so in that case we use the branch
       name for the "feature" in the scenario name: os-odl-queens-noha.
     - Tacker/Congress are disabled in settings files until we fix that with
       upstream.  Containers are now enabled by default.
     - Disable TLS for undercloud (was changed upstream to default enabled)
     - Fix environments docker directory for master THT (was changed upstream)
     - Includes fix for LP#1768901
     - Includes workaround for LP#1770692
     - Moves to docker.io for container images as it is more stable and
       should contain the same images
     - Removes the term 'common' from apex packaging for referencing the
       Python Apex package

    Change-Id: If6b433860b3ff882686c78d0f24a2f0c52b9b57a
    Signed-off-by: Tim Rozet <trozet@redhat.com>