FIX: Unneded (extra) cycles in some tasks (#1393)

roles/vault/tasks/shared/check_vault.yml

@@ -29,3 +29,4 @@
   set_fact:
     vault_cluster_is_initialized: "{{ vault_is_initialized or hostvars[item]['vault_is_initialized'] }}"
   with_items: "{{ groups.vault }}"
+  run_once: true

roles/vault/tasks/shared/find_leader.yml

@@ -15,3 +15,6 @@
     vault_leader_url: "{{ vault_config.listener.tcp.tls_disable|d()|ternary('http', 'https') }}://{{ item }}:{{ vault_port }}"
   with_items: "{{ groups.vault }}"
   when: "hostvars[item]['vault_leader_check'].get('status') == 200"
+  run_once: true
+
+- debug: var=vault_leader_url verbosity=2