Merge branch 'master' into master

Vagrantfile

ansible.cfg

contrib/terraform/openstack/ansible_bastion_template.txt

contrib/terraform/openstack/modules/network/outputs.tf

docs/vagrant.md

docs/vars.md

inventory/sample/group_vars/k8s-cluster.yml

roles/dnsmasq/tasks/main.yml

roles/dnsmasq/templates/dnsmasq-clusterrolebinding.yml

roles/dnsmasq/templates/dnsmasq-deploy.yml

roles/dnsmasq/templates/dnsmasq-serviceaccount.yml

roles/dnsmasq/templates/dnsmasq-svc.yml

roles/docker/defaults/main.yml

roles/docker/tasks/main.yml

roles/docker/tasks/pre-upgrade.yml

roles/docker/vars/redhat.yml

roles/download/defaults/main.yml

roles/download/tasks/download_container.yml

roles/download/tasks/download_file.yml

roles/download/tasks/sync_container.yml