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/kubeadm/tasks/kubeadm_etcd_node.yml

@@ -22,7 +22,6 @@
     {{ kubeadm_discovery_address }}
   args:
     creates: "{{ kube_cert_dir }}/apiserver-etcd-client.key"
-  environment: "{{ proxy_disable_env }}"
 
 - name: Delete unneeded certificates
   file:

roles/kubernetes/kubeadm/tasks/main.yml

@@ -42,7 +42,6 @@
 
 - name: Create kubeadm token for joining nodes with 24h expiration (default)
   command: "{{ bin_dir }}/kubeadm token create"
-  environment: "{{ proxy_disable_env }}"
   register: temp_token
   delegate_to: "{{ groups['kube-master'][0] }}"
   when: kubeadm_token is not defined
@@ -55,7 +54,6 @@
 
 - name: Get the kubeadm version
   command: "{{ bin_dir }}/kubeadm version -o short"
-  environment: "{{ proxy_disable_env }}"
   register: kubeadm_output
   changed_when: false
 
@@ -71,7 +69,8 @@
   when: not is_kube_master
 
 - name: Join to cluster if needed
-  environment: '{{ proxy_disable_env | combine({"PATH": "{{ bin_dir }}:{{ ansible_env.PATH }}:/sbin"}) }}'
+  environment:
+    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}:/sbin"
   when: not is_kube_master and (not kubelet_conf.stat.exists)
   block: