Move CI vars out of gitlab and into var files (#1808)

.gitlab-ci.yml

roles/bootstrap-os/tasks/bootstrap-ubuntu.yml

roles/bootstrap-os/tasks/main.yml

roles/kubernetes-apps/ansible/defaults/main.yml

tests/cloud_playbooks/create-gce.yml

tests/files/centos-weave-kubeadm.yml

tests/files/centos7-calico-ha.yml

tests/files/centos7-flannel-addons.yml

tests/files/coreos-alpha-weave-ha.yml

tests/files/coreos-calico-aio.yml

tests/files/coreos-canal.yml

tests/files/debian8-calico.yml

tests/files/rhel7-canal-sep.yml

tests/files/rhel7-weave.yml

tests/files/ubuntu-canal-ha.yml

tests/files/ubuntu-canal-kubeadm.yml

tests/files/ubuntu-flannel.yml

tests/files/ubuntu-rkt-sep.yml

tests/files/ubuntu-vault-sep.yml

tests/files/ubuntu-weave-sep.yml