fix all ansivle_lint warnings

.ansible-lint

roles/base/tasks/main.yml

roles/base/tasks/mesh-vpn.yml

roles/base/tasks/radvd.yml

roles/base/tasks/software.yml

roles/ffhl_nameserver/tasks/main.yml

roles/ffhl_nameserver/tasks/powerdns.yml

roles/icvpn/tasks/icvpn-meta.yml

roles/icvpn/tasks/main.yml

roles/services/tasks/base.yml

roles/services/tasks/nginx.yml