Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Removes build.sh

    We now have build.py which handles all the building and build.sh was
    just a wrapper to include ansible playbook.  Now that we have built in
    apex libs to run ansible there is no reason to keep build.sh anymore.

    Also simplifies the logic to determine apex root by using the git
    properties.

    Change-Id: I00d2e5c7c198e549d21936bb1e9b562ba93d3010
    Signed-off-by: Tim Rozet <trozet@redhat.com>