Support for Oracle Linux (#3655)

.gitlab-ci/gce.yml

.gitlab-ci/packet.yml

README.md

Vagrantfile

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

roles/bootstrap-os/tasks/main.yml

roles/container-engine/cri-o/tasks/main.yaml

roles/container-engine/docker/tasks/main.yml

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

roles/kubernetes/preinstall/tasks/main.yml

...fra/image-builder/roles/kubevirt-images/defaults/main.yml

tests/cloud_playbooks/roles/packet-ci/defaults/main.yml

tests/files/gce_oracle-canal.yml

tests/files/packet_oracle-7-canal.yml