Purge legacy cleanup tasks from older than 1 year (#4450)

We don't need to support upgrades from 2 year old installs,
just from the last major version.

Also changed most retried tasks to 1s delay instead of longer.

roles/kubernetes-apps/ansible/tasks/netchecker.yml

@@ -51,15 +51,6 @@
   when:
     - inventory_hostname == groups['kube-master'][0]
 
-- name: Kubernetes Apps | Purge old Netchecker server
-  kube:
-    name: "netchecker-server"
-    namespace: "{{ netcheck_namespace }}"
-    kubectl: "{{bin_dir}}/kubectl"
-    resource: "po"
-    state: absent
-  when: inventory_hostname == groups['kube-master'][0]
-
 - name: Kubernetes Apps | Start Netchecker Resources
   kube:
     name: "{{item.item.name}}"