Ensure kubeadm doesn't use proxy (#7275)

* Move proxy_env to kubespray-defaults/defaults

There is no reasons to use set_facts here

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

* Ensure kubeadm doesn't use proxy

*_proxy variables might be present in the environment (/etc/environment, bash profile, ...)
When this is the case we end up with those proxy configuration in /etc/kubernetes/manifests/kube-*.yaml manifests

We cannot unset env variables, but kubeadm is nice enough to ignore empty vars
93d288e2a4/cmd/kubeadm/app/util/env.go (L27)

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

roles/kubernetes/kubeadm/tasks/main.yml

@@ -42,6 +42,7 @@
 
 - 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
@@ -54,6 +55,7 @@
 
 - name: Get the kubeadm version
   command: "{{ bin_dir }}/kubeadm version -o short"
+  environment: "{{ proxy_disable_env }}"
   register: kubeadm_output
   changed_when: false
 
@@ -69,8 +71,7 @@
   when: not is_kube_master
 
 - name: Join to cluster if needed
-  environment:
-    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}:/sbin"  # Make sure we can workaround RH / CentOS conservative path management
+  environment: '{{ proxy_disable_env | combine({"PATH": "{{ bin_dir }}:{{ ansible_env.PATH }}:/sbin"}) }}'
   when: not is_kube_master and (not kubelet_conf.stat.exists)
   block: