pwgen: rewrite checks and passwords generation

roles/pwgen/tasks/main.yaml

@@ -1,7 +1,22 @@
-- name: Create passwords.yaml file
+- name: Check that passwords.yaml exists
+  stat:
+    path: "{{ inventory_dir }}/group_vars/all/passwords.yaml"
+  register: passwords_file
+
+- name: Create passwords.yaml file if not exists
   file: 
     name: "{{ inventory_dir }}/group_vars/all/passwords.yaml"
     state: touch
+  when: not passwords_file.stat.exists
+
+- name: Read passwords.yaml file
+  slurp:
+    src: "{{ inventory_dir }}/group_vars/all/passwords.yaml"
+  register: passwords_b64
+
+- name: Set facts about passwords
+  set_fact:
+    passwords: "{{ passwords_b64['content'] | b64decode | from_yaml }}"
 
 - name: Create files directory for ddclient tsig
   file: