Proxy is configured for K8S components after upgrade-cluster.yml

[champtar]

After upgrade (upgrade-cluster.yml) proxy variables are set for K8S components,
they are not set after install (cluster.yml) and should not be set as K8S doesn't need to talk to the outside world

# grep -ri _proxy /etc
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: NO_PROXY
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: no_proxy
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: HTTP_PROXY
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: http_proxy
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: HTTPS_PROXY
/etc/kubernetes/manifests/kube-apiserver.yaml:    - name: https_proxy
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: NO_PROXY
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: no_proxy
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: HTTP_PROXY
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: http_proxy
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: HTTPS_PROXY
/etc/kubernetes/manifests/kube-controller-manager.yaml:    - name: https_proxy
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: NO_PROXY
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: no_proxy
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: HTTP_PROXY
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: http_proxy
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: HTTPS_PROXY
/etc/kubernetes/manifests/kube-scheduler.yaml:    - name: https_proxy

This actually causes issues with webhooks like ingress-nginx

Error: Internal error occurred: failed calling webhook "validate.nginx.ingress.kubernetes.io": Post https://ingress-nginx-controller-admission.ingress-nginx.svc:443/networking/v1beta1/ingresses?timeout=10s: Service Unavailable

Environment:

• Cloud provider or hardware configuration:
  qemu/kvm/libvirt VMs

• OS (printf "$(uname -srm)\n$(cat /etc/os-release)\n"):
  Linux 4.18.0-240.1.1.el8_3.x86_64 x86_64
  NAME="CentOS Linux"
  VERSION="8"

• Version of Ansible (ansible --version):
  ansible 2.9.16

• Version of Python (python --version):
  Python 3.9.1

Kubespray version (commit) (git rev-parse --short HEAD):
c0fe32c

Network plugin used:
Calico

Full inventory with variables (ansible -i inventory/sample/inventory.ini all -m debug -a "var=hostvars[inventory_hostname]"):
containerd / etcd host

Command used to invoke ansible:
ansible-playbook -i ../ansible-inventories/kubespray/inventory-sj150-master/inventory.ini upgrade-cluster.yml

Output of ansible run:

Anything else do we need to know:
Already working on it in #7095