Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Migrates Apex to Python"
  - Migrates Apex to Python

    Removes all bash libraries and converts almost all of the code to a
    mixture of Python and Ansible.  utils.sh and clean.sh still exist.
    clean.sh will be migrated fully to clean.py in another patch.

    The Apex Python package is now built into the opnfv-apex-common RPM.  To
    install locally do 'pip3 install .'.  To deploy:

    opnfv-deploy -d <file> -n <file> --image-dir /root/apex/.build  -v --debug

    Non-python files (THT yaml, settings files, ansible playbooks) are all
    installed into /usr/share/opnfv-apex/.  The RPM will copy settings files
    into /etc/opnfv-apex/.

    JIRA: APEX-317

    Change-Id: I3232f0329bcd13bce5a28da6a8c9c84d0b048024
    Signed-off-by: Tim Rozet <trozet@redhat.com>