Merge "Upgrade from docker-py to docker"

ansible/library/kolla_container_facts.py

ansible/library/kolla_docker.py

ansible/library/kolla_toolbox.py

ansible/roles/baremetal/tasks/install.yml

ansible/roles/prechecks/tasks/package_checks.yml

ansible/roles/prechecks/vars/main.yml

contrib/dev/vagrant/bootstrap.sh

doc/quickstart.rst

requirements.txt

tests/test_kolla_docker.py

tools/setup_gate.sh