Merge pull request #956 from adidenko/update-netchecker

docs/netcheck.md

roles/download/defaults/main.yml

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

...kubernetes-apps/ansible/templates/netchecker-agent-ds.yml

...es-apps/ansible/templates/netchecker-agent-hostnet-ds.yml

...bernetes-apps/ansible/templates/netchecker-server-pod.yml

roles/kubernetes-apps/meta/main.yaml

roles/kubernetes/node/meta/main.yml