NTP: define servers with a list instead of few variables

etc/host_vars/localhost.example

@@ -1,9 +1,11 @@
---- 
+---
 admin_ssh_keys: ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDZXK3ufonx+zNQ1x6cSWuUWckB/xf9sKZ+mRgY5SPXzqrxSkqNSmr9JQ6xzvhxKEVcFWsi50op1WWtRo3HG3p3+EHKXeCyzt5QnczDlVOoQbB8kgI0byKcvXux1inL4/Q4DbVLUbDFnynD/C5aAyYMYePahMxR+AQr60DD+7Ty6pcEVih1wwHIlxWziY1EF6sEzQwz/PiTxWIZkKHl/WPGagS9Pp/5nQfdZy0AS/JqbzNyMEg51+XedADuqseV4GXDzrzDYLJXJFv1PFVJxRWLrjChKrUMqyszUySkZMr5YSPXlsV0bi+0xivYEsXvIkLORV96JTZosYbV+0aFKDPv root@debian
 default_packages_debian: htop
 description: machine test
-ntp_server1: 0.pool.ntp.org
-ntp_server2: 1.pool.ntp.org
+ntp_servers:
+  - 0.pool.ntp.org
+  - 1.pool.ntp.org
+  - 2.pool.ntp.org
 disable_ipv6: true
 domain: test.net
 mariadb_version: 10.0

roles/common/templates/etc-ntp.conf.j2

@@ -6,12 +6,12 @@ statistics loopstats peerstats clockstats
 filegen loopstats file loopstats type day enable
 filegen peerstats file peerstats type day enable
 filegen clockstats file clockstats type day enable
-server {{ ntp_server1 }}
-server {{ ntp_server2 }}
+{% for server in ntp_servers %}
+server {{ server }}
+restrict {{ server }} nomodify nopeer
+restrict {{ server }} nomodify nopeer
+{% endfor %}
 restrict default ignore
 restrict -6 default ignore
 restrict 127.0.0.1
 restrict ::1
-restrict {{ ntp_server1 }} nomodify nopeer
-restrict {{ ntp_server2 }} nomodify nopeer
-