Fix proxy usage when *_PROXY are present in environment (#7309)

Since a790935d02 all proxy users
should be properly configured

Now when you have *_PROXY vars in your environment it can leads to failure
if NO_PROXY is not correct, or to persistent configuration changes
as seen with kubeadm in 1c5391dda7

Instead of playing constant whack-a-bug, inject empty *_PROXY vars everywhere
at the play level, and override at the task level when needed

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

roles/kubernetes/control-plane/tasks/kubeadm-secondary.yml

@@ -16,7 +16,6 @@
     --config {{ kube_config_dir }}/kubeadm-config.yaml
     upload-certs
     --upload-certs
-  environment: "{{ proxy_disable_env }}"
   register: kubeadm_upload_cert
   when:
     - inventory_hostname == groups['kube-master']|first
@@ -58,7 +57,8 @@
     {{ bin_dir }}/kubeadm join
     --config {{ kube_config_dir }}/kubeadm-controlplane.yaml
     --ignore-preflight-errors=all
-  environment: '{{ proxy_disable_env | combine({"PATH": "{{ bin_dir }}:{{ ansible_env.PATH }}"}) }}'
+  environment:
+    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
   register: kubeadm_join_control_plane
   retries: 3
   throttle: 1