Merge pull request #2508 from melkosoft/cilium

.gitlab-ci.yml

roles/download/defaults/main.yml

roles/network_plugin/cilium/templates/cilium-cr.yml.j2

roles/network_plugin/cilium/templates/cilium-ds.yml.j2

tests/files/gce_centos7-cilium.yml

tests/files/gce_coreos-cilium.yml

tests/files/gce_rhel7-cilium.yml

tests/files/gce_ubuntu-cilium-sep.yml