Update playbooks to support new netchecker

Netchecker is rewritten in Go lang with some new args instead of
env variables. Also netchecker-server no longer requires kubectl
container. Updating playbooks accordingly.

roles/kubernetes-apps/meta/main.yaml

@@ -12,9 +12,5 @@ dependencies:
     file: "{{ downloads.netcheck_agent }}"
     when: deploy_netchecker
     tags: [download, netchecker]
-  - role: download
-    file: "{{ downloads.netcheck_kubectl }}"
-    when: deploy_netchecker
-    tags: [download, netchecker]
   - {role: kubernetes-apps/ansible, tags: apps}
   - {role: kubernetes-apps/kpm, tags: [apps, kpm]}