remove deprecation warns and update doc

roles/kubernetes/secrets/tasks/gen_certs.yml

@@ -1,11 +1,11 @@
 ---
 - name: certs | write openssl config
-  sudo: False
+  become: False
   local_action: template src="openssl.conf.j2" dest="{{ role_path }}/files/openssl.conf"
   run_once: yes
 
 - name: certs | run cert generation script
-  sudo: False
+  become: False
   local_action: shell
     {{ role_path }}/scripts/make-ssl.sh
     -f {{ role_path }}/files/openssl.conf

roles/kubernetes/secrets/tasks/gen_tokens.yml

@@ -1,6 +1,6 @@
 ---
 - name: tokens | generate tokens for master components
-  sudo: False
+  become: False
   local_action: command "{{ role_path }}/scripts/kube-gen-token.sh" "{{ item[0] }}-{{ item[1] }}"
   environment:
     TOKEN_DIR: "{{ role_path }}/files/tokens"
@@ -12,7 +12,7 @@
   notify: set secret_changed
 
 - name: tokens | generate tokens for node components
-  sudo: False
+  become: False
   local_action: command "{{ role_path }}/scripts/kube-gen-token.sh" "{{ item[0] }}-{{ item[1] }}"
   environment:
     TOKEN_DIR: "{{ role_path }}/files/tokens"