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>

remove-node.yml

@@ -4,6 +4,7 @@
 
 - hosts: "{{ node | default('etcd:k8s-cluster:calico-rr') }}"
   gather_facts: no
+  environment: "{{ proxy_disable_env }}"
   vars_prompt:
     name: "delete_nodes_confirmation"
     prompt: "Are you sure you want to delete nodes state? Type 'yes' to delete nodes."
@@ -18,6 +19,7 @@
 
 - hosts: kube-master[0]
   gather_facts: no
+  environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults }
     - { role: bootstrap-os, tags: bootstrap-os }
@@ -25,6 +27,7 @@
 
 - hosts: "{{ node | default('kube-node') }}"
   gather_facts: no
+  environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults, when: reset_nodes|default(True)|bool }
     - { role: bootstrap-os, tags: bootstrap-os, when: reset_nodes|default(True)|bool }
@@ -34,6 +37,7 @@
 # Currently cannot remove first master or etcd
 - hosts: "{{ node | default('kube-master[1:]:etcd[1:]') }}"
   gather_facts: no
+  environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults, when: reset_nodes|default(True)|bool }
     - { role: bootstrap-os, tags: bootstrap-os, when: reset_nodes|default(True)|bool }