Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Ansible Playbook to install build server deps

    This playbook has been tested in centos and ubuntu
    on Arm and x86_64

    first:
    install ansible
    then:
    ansible-playbook -i inventory.ini main.yml

    What it does:
    installs on centos or ubuntu arm or x86_64

    installs system deps with the package manager.
    and python libs with pip.

    installs docker
    https://download.docker.com

    installs docker-compose from distribution repo

    Change-Id: I3853cd04d0e6c7270ea068b9e1fba1a240a0652e
    Signed-off-by: agardner <agardner@linuxfoundation.org>